Q.20 How many four-digit even numbers are there which have 0 and 1 as two of the digits and the remaining two are distinct digits among 2, 4 and 6?
A. 42
B. 36
C. 38
D. 30
Two friends A and B run on a circular track of length 510m, starting from the same point, simultaneously and in same direction. A who runs faster laps B in the middle of the 5th round. If A and B were to run a 3km race, how much start in terms of distance should A give B so that they finish the race in dead heat.
Ans 666.66.
Please explain the approach.
The hr hand on my watch moves at the correct speed, but the minute hand moves one and a half times as fast as it should. yesterday it showed correct time at 3p.m. When did it next show the correct time ?
A group of men working at the same rate can finish job in 45 hrs. However , the men report to work, one at a time, at equal intervals over a period of time. Once on the job , each man stays until the job is finished. If the man first works five times as may hrs as the last man , find the total no of hrs the first man works and total no of man in the group.
Ans (75hrs , 61men)
Please explain how to solve it
A person can build a road 15 m long in 300 days and employs 45 men fro the purpose.After 100 days he finds only 2.5m road has been completed. Find the number of extra men he must employ to finish the work on time.
Time and Work
Can anyone please explain what does giving a headstart in terms of distance and time means?
For example : In 1km race, A give B a headstart of 100m. Here who will have to travel 900m and who will have to 1000m.
Similarly A give B a headstart of 10 sec. Here who started the race first?
The equation 4x - Ay = B has a number of integral solutions. If HCF(A,4) = 1 and the number of solutions (x,y) for 0
- 2
- 1
- 3
- none of these
- 5
0 voters
Scientist decided to do a study on the population growth of rabbits. Inside a controlled environment, 1000 rabbits were placed. Six months later, there were 1000Z rabbits. At the beginning of the 3rd year,
there were roughly 2828Z rabbits, which was 4 times what the scientists placed in there at the beginning of the 1st year. If Z is a positive variable, how many rabbits would be there at the beginning of
the 11th year?
A student has got marks in five subjects in the ratio 2:3:4:5:6. The maximum marks of subjects in same sequence are in the ratio 6:5:8:4:7. Total percentage of marks scored by him is 48%. Find the maximum percentage obtained by him in a subject
Pls share approach
- 96
- 90
- 65
- 78
0 voters
Last two digit of 9483^67483?
Lo bhaiyo calander concept:
CALENDAR CONCEPT :
1. 1st January 0001 was a Monday.
2. Calendar repeats after every 400 years.
3. Leap year- it is always divisible by 4, but century years are not leap years unless they are divisible by 400.
4. Odd days- remainder obtained when no. of days is divided by 7. Normal year has 1 odd day and leap year has 2 odd days.
5. Calendar moves ahead by number of odd days.
6. While checking leap year just analyze whether February falls in that period or not.
7. Century has 5 odd days and leap century has 6 odd days.
8. Take out net odd days.( add all the odd days and again divide by 7)
9. In a normal year 1st January and 2nd July and 1st October fall on the same day. In a leap year 1st January 1st July and 30th September fall on the same day.
10. 1st January 1901 was Tuesday.
11. We calculate odd days on the basis of the previous month.
Example What day is it on 29th August 1982?
Method-
As we know 1/1/1901 was a Tuesday now we take 1982 and 1901
- 1982-1901 = 81 years.
- 81/4=20 . (disregard decimal)
- 81+20 = 101
- 101/7 - remainder is 3, so 3 days from Tuesday is Friday.
- Now check whether it is a leap year or not. In this case it is not a leap year. Therefore 2nd July will be Friday
- Now we have to go month wise . 2nd august = 3 odd days = so from Friday 3 odd days will be Monday so 29th August will be a Sunday.
Find the sum of digits of first 10000 natural numbers.
A corrupt rice vendor uses a weight of 1200 grams instead of 1 kg while buying rice, and uses a weight of 900 grams instead of 1 kg while selling it. He also adds 5 kg of white stones per 100 kg of rice to get more money. If he gives a discount of 10% to his customers on cost price then how much profit does he make?,,,, expln apprch ,,, @placiddisciple @Akrosh007
😠😠😠😠
1)22 % 2)24 % 3)26 % 4)28 % 5)30 %
€‹(1/log2n) + (1/log3n) + (1/log4n) +………+ (1/lognn)
2 3 4 and n are subscripts i.e. base of the log
- 1
- 49
- (1/logn to the base 49 factorial)
- (1/log49 to the base n factorial)
0 voters
Second last digit of 154^84??
Instead of a metre scale a cloth merchant uses 120 cm while buying but uses an 80 cm scale while selling the same cloth.he offers a discount of 20 % on cash payment , what is his overall profit?
Let P = {n! + 1, n! + 2, ..., n! + n} such that 'n' is a natural number greater than 42. At the most, how many elements in set P can be prime numbers?
a) 0
b) 1
c) 2
d) more than 2
Let a, b, c and d be positive integers satisfying the equations logb(base a)=5/4 and logd(base c) = 3/2 and a-c=32 . Find d - b
An article was marked at a certain percentage above the cost price. It is then sold for a profit after offering a discount. The sum of the profit and the discount equals the sum of its cost price and the difference of twice its marked price and thrice its cost price. Find the mark up percentage.