# DI a day

Hello Puys, I am opening this thread in order to expose more to DI problems. Though we have LR-DI thread, i find most of the questions are LR. Hence starting a new thread exclusively for DI. i request all to participate and post one good set …

Hello Puys,

I am opening this thread in order to expose more to DI problems. Though we have LR-DI thread, i find most of the questions are LR. Hence starting a new thread exclusively for DI. i request all to participate and post one good set daily..

By this we will get exposed to more and diff types of questions in DI..

All the Best puys..

For Questions 1 to 5 read the following instructions:
The following Table gives the number of students in all the different classes of Indian Public school in the years 2050 and 2051 respectively.

Class --------Students in the year 2050 -------Students in the year 2051
VII ------------------120 ------------------------------140
VIII ------------------84 -------------------------------100
IX --------------------72 --------------------------------70
X ---------------------64 --------------------------------60
XI --------------------48 ---------------------------------56
XII --------------------36 --------------------------------54

It is known that
i. New students join the school only in class VII
ii. No student leaves the school before passing out from class XII
iii. The students, who fail, have to repeat the year.

Q1]If no student of class XI failed in the year 2020, then what is the pass percentage of class XII for the year 2050?
a. 22.66% b. 16.66% c. 83.33% d. 77.77% e. None of these

Q2]If the new joiners in the year 2051 were 76, then the number of students failed in class XII in the year 2050?
a. 10 b. 14 c. 8 d. 16 e. 20

Q3]How many students of class IX failed in the year 2050, if no student of class XI failed in the year 2050?
a. 12 b. 8 c.10 d. 14 e. None of these

Q4]If number of students of class VII failed in the year 2050 is 64, then what is the total number of students failed in the year 2050?
a. 150 b. 182 c. 195 d. 164 e. 176

Q5]The highest pass percentage of class VII can be?
a. 55% b. 60% c. 58% d. 50% e. 65%

Q1]If no student of class XI failed in the year 2020, then what is the pass percentage of class XII for the year 2050?
a. 22.66% b. 16.66% c. 83.33% d. 77.77% e. None of these

Q2]If the new joiners in the year 2051 were 76, then the number of students failed in class XII in the year 2050?
a. 10 b. 14 c. 8 d. 16 e. 20

Q3]How many students of class IX failed in the year 2050, if no student of class XI failed in the year 2050?
a. 12 b. 8 c.10 d. 14 e. None of these

Q4]If number of students of class VII failed in the year 2050 is 64, then what is the total number of students failed in the year 2050?
a. 150 b. 182 c. 195 d. 164 e. 176

Q5]The highest pass percentage of class VII can be?
a. 55% b. 60% c. 58% d. 50% e. 65%
did these questions half asleep so may be wrong

For Questions 1 to 5 read the following instructions:
The following Table gives the number of students in all the different classes of Indian Public school in the years 2050 and 2051 respectively.

Q1]If no student of class XI failed in the year 2020, then what is the pass percentage of class XII for the year 2050?
a. 22.66% b. 16.66% c. 83.33% d. 77.77% e. None of these

Q2]If the new joiners in the year 2051 were 76, then the number of students failed in class XII in the year 2050?
a. 10 b. 14 c. 8 d. 16 e. 20

Q3]How many students of class IX failed in the year 2050, if no student of class XI failed in the year 2050?
a. 12 b. 8 c.10 d. 14 e. None of these

Q4]If number of students of class VII failed in the year 2050 is 64, then what is the total number of students failed in the year 2050?
a. 150 b. 182 c. 195 d. 164 e. 176

Q5]The highest pass percentage of class VII can be?
a. 55% b. 60% c. 58% d. 50% e. 65%

My answers in Bold...!

spectramind07 Says

c
d
e-20 to be xact
b
a

TAkes on set 1 by spectra sir!!!
1) C
2) d
3) e
4) b
5) i am not able to do it.. could anyone explain it.. wat i tot was in order to max pass % of class 7 i need to minimise the pass % of class twelve... pls on this

my takes
c
d
e
b
a

My Take for SET 1
1) c
2) d
3) e(20 students)
4) b
5) a
I have a few queries :
After seeing this problem I actually started building a table with how many passed and how many failed in 2050/2051. However actually in this only two questions(1&3) were based on the data as given in the question without changing anything. For the rest of the questions new info was required. so my question, did you guys build the table and started answering the questions or first saw the questions and then built the data? I am asking because, did you guys see any other set of the same type for which the table has to be built for each question, In that case I feel building table after reading questions would be judicious!
I am a beginner, do not grin if me question is too basic!
Thanks!
Puys could you share some questions on knockout tournament? I find these question very tricky!
set 2:
Problem 1The table below gives the average fares (in paise/km) for 2002-03 and the simple average annual percentage increase in the fares per km, for the three - year period from 1999-2000 to 2002-03, for the Road Transport Corporations (RTC's) of five different states, for various services. For each of the services of any RTC, the total distance (in km) covered in 1999-2000 is same as that in 2002-03. For each of the RTCs, there are no other services other than those mentioned.

1. What is the approximate absolute value (in paise/km) of the maximum decrease in the fares for any service in any state in the given period?
(1) 11 (2) 15 (3) 8 (4) 4

2. What is the approximate absolute value (in paise/km) of the maximum increase in the fares for any service in any state in the given period?

(1) 25 (2) 28 (3) 32(4) 35

3. If the average fare for each of the RTCs is calculated for the year 2002-03, based on the composition of services using the weighted average method, then the average fare for which of the following RTCs is necessarily lower than that for APSRTC?

(1) KSRTC(2) MSRTC(3) RSRTC(4) None of these

Problem2
pls find figures attached.. 2nd and 3rd one.. for this sum.. the 1st one for 1st prob..
9. In the year 2002, the exports (by value) of scooters were 37.5% of their total sales. What is the ratio of the average price per scooter in the domestic market and the average export price per scooter?

(1) 5 : 7
(2) 5 : 9
(3) 4 : 5
(4) 4 : 7
Solution

10. In which of the following years were the total sales (by volume) of bikes as a percentage of total production of bikes the least?

(1) 2000
(2) 2003
(3) 2002
(4) 2004
Solution

11. Considering each product in each year as an instance, how many instances are there when the total sales (by volume) of a product are same as the total volume of production of that product?

(1) 3
(2) 4
(3) 5
(4) 6
TAkes on set 1 by spectra sir!!!
1) C
2) d
3) e
4) b
5) i am not able to do it.. could anyone explain it.. wat i tot was in order to max pass % of class 7 i need to minimise the pass % of class twelve... pls on this

My aaproach, max students that can pass class 11 is 48 in 2050 , You have to back track to class 7 from here. It would be consume time if you start from calculating max number of students who pass class 7 in 2050.
For Questions 1 to 5 read the following instructions:
The following Table gives the number of students in all the different classes of Indian Public school in the years 2050 and 2051 respectively.

Class --------Students in the year 2050 -------Students in the year 2051
VII ------------------120 ------------------------------140
VIII ------------------84 -------------------------------100
IX --------------------72 --------------------------------70
X ---------------------64 --------------------------------60
XI --------------------48 ---------------------------------56
XII --------------------36 --------------------------------54

It is known that
i. New students join the school only in class VII
ii. No student leaves the school before passing out from class XII
iii. The students, who fail, have to repeat the year.

Q1]If no student of class XI failed in the year 2020, then what is the pass percentage of class XII for the year 2050?
a. 22.66% b. 16.66% c. 83.33% d. 77.77% e. None of these

Q2]If the new joiners in the year 2051 were 76, then the number of students failed in class XII in the year 2050?
a. 10 b. 14 c. 8 d. 16 e. 20

Q3]How many students of class IX failed in the year 2050, if no student of class XI failed in the year 2050?
a. 12 b. 8 c.10 d. 14 e. None of these

Q4]If number of students of class VII failed in the year 2050 is 64, then what is the total number of students failed in the year 2050?
a. 150 b. 182 c. 195 d. 164 e. 176

Q5]The highest pass percentage of class VII can be?
a. 55% b. 60% c. 58% d. 50% e. 65%
\
Here are the OAs

A general formula here is Strength (c, y) = Pass(c-1,y-1) + Fail(c,y-1)
Where c is the class and y is the year.

Q1)
No. of failures in class XII in 2050 is 54-48=6. Hence the pass percentage is 5/6*100.ie 83.33.Option C

Q2)
Back track and obtain the failures and passes in that particular year from the formula. Answer is 16.Option D

Q3)
Same procedure, start from the bottom. Answer is 20.Option E

Q4)
This is a supplement of question. no 7. Answer is 182.Option B

Q5)
The highest pass percentage for class VII can be obtained only when class XI has no failures( because, all the other classes have certainly a min number of failures).Youl get it as 66. so its 66/120 ie.55%.Option A

All did well.:thumbsup:
set 2:
The table below gives the average fares (in paise/km) for 2002-03 and the simple average annual percentage increase in the fares per km, for the three - year period from 1999-2000 to 2002-03, for the Road Transport Corporations (RTC's) of five different states, for various services. For each of the services of any RTC, the total distance (in km) covered in 1999-2000 is same as that in 2002-03. For each of the RTCs, there are no other services other than those mentioned.

1. What is the approximate absolute value (in paise/km) of the maximum decrease in the fares for any service in any state in the given period?
(1) 11 (2) 15 (3) 8 (4) 4

2. What is the approximate absolute value (in paise/km) of the maximum increase in the fares for any service in any state in the given period?

(1) 25 (2) 28 (3) 32 (4) 35

3. If the average fare for each of the RTCs is calculated for the year 2002-03, based on the composition of services using the weighted average method, then the average fare for which of the following RTCs is necessarily lower than that for APSRTC?

(1) KSRTC (2) MSRTC (3) RSRTC (4) None of these

@ chandrakant, I think you forgot to give table

Subscribing..

DI St-02

1-1
2-2
3-none of these. I think all RTs will have lower rate or am I missing something

Hi Spectra bhai ... I find it difficult to understand the logic posted for the set u gave ... these are repeatedly asked in mocks but i miss out :banghead:... can u pls explain atleast for one on hw to form the table from the data given for 2050 n 2051 ?

Di Set 02 Problem 2:
1) 1(got 16:35) approx
2) 3(2002 5% less)
3) 4
Some one help with an easy approach for DI set 02 Problem 1, I am finding it very cal intensensive. there should be an easy way for it!

Sachin Fan Says
Hi Spectra bhai ... I find it difficult to understand the logic posted for the set u gave ... these are repeatedly asked in mocks but i miss out :banghead:... can u pls explain atleast for one on hw to form the table from the data given for 2050 n 2051 ? :cheers:

quoting spectra bhai's formula,
A general formula here is Strength (c, y) = Pass(c-1,y-1) + Fail(c,y-1)

what he means to say is that
now for questions where u need to find the number of failed students

say if u want to find the number of failed students in class 6 in 2050
so c= 6 y = 2050

the number of students in class 2051 for class 6 are 140 and 76 have entered newly
so 140 = 76 + Fail(6,2050)
so by this, number of students who Failed in 6th std are 140-76 = 64

Now to calculate for class 7 in 2051

100 = Pass(6, 2050) + Fail (7, 2050) = (120-64) +Fall(7, 2050)
so u get Fail(7 , 2050) = 44

I hope this what you mean spectra bhai!!!

P.S here though 76 does not represent the number of students passed in class 5(as we do not have class 5) but it is given that 76 new joinees are there. so we can substitute that value here.

takes on prob 1 of set 2
1) 1
2) 1