[pagalneha]

Hey guys,
its nice to c ppl taking this sec. so seriously. i liked the way u all discuss the problems, but one thing i wud like to say is that u shud use the equation method mimimum possible, coz it takes a lot of time. its ok if u don't get the ans. try with equation method, but later think of some other coz... it is time consuming.

and hey raghuveer that graph was good. it is good way of explaining these kinda questions.

all of u keep up the good work.

[Nawab]

fine got all answeresss sorry for disturbing

[pagalneha]

1. If 3:21::a:63, then find the value of a
2. If a:b=8:15,b:c=5:8 and c:d=4:5 find a:d
3. Find the mean proportion to 9 and 4.9
4. Find the third proportional of 6 and 30
5. The ratio between 2 quantities is 5:7, If the first is 155, find the other.
6. the shadow of qutab minar , which is 72 mts. High is 8 mts. At a particular time of day. Find the height of an electric pole which casts a shadow of 10 mts, under the similar conditions on the same day and time.
7. Two car drivers take 3 ¼ hours and 4 hrs. respectively to cover a distance of 650 kms. From a city P to Q. Find the ratio of the average speeds of the two cars.
8. Two numbers bear a ratio of 2:7. If each of them is increased by 14, then their ratio becomes 4:7. find the two nos.
9. Two numbers are in the ratio of 4:7.The difference of their squares is 132. Find the numbers.
10. If 16 men working 7 hrs. a day can plough a field in 48 days, in how many days will 28 boys working 12 hours a day plough the same field, if one man does a work as 2 boys.

Answers.
1. 9
2. a:d=4:15
3. 2.1
4. 150
5. 217
6. 90mts.
7. 16:13
8. 6 and21
9. 8 and14
10. 4 days.

[zeus]

not at all dude,

u got us thinking at least!

adi

[pagalneha]

1. A contractor undertook to finish a certain work in 124 days and employed 120 men. After 64 days, he found that he had already done 2/3 of the work. How many men can be discharged now so that the work may finish in time?
2. The length and breadth of a rectangle are increased in the ratio 3:4 and 4:5 respectively. Find the ratio between new ones and old areas.
3. A man went to the market to buy fruits. He bought apples, mangoes and dates. The ratio of the weight of apples to that of mangoes bought is the same as the weight of mangoes to that of dates bought . if ha bought 7.2 kgs of apples and 5 kg of dates, find the weight of mangoes bought.
4. A grey hound pursues a hare and takes 4 leaps for every 5 leaps of the hare; but 3 leaps of the hound are equal to 4 leaps of the hare, compare the rates od the hound and hare.
5. A mixture consists of three substances whose volumes are in the ratio 5:6:8. the weights of equal volumes are in the ratio 4:5:3.what is the ratio of the weight of the three substances composing the mixture?
6. The force of gravity at the surface of a planet is jointly proportional to the density of the planet and its radius. The planet Jupiter has a radius equal to ten times the radius of the earth. The densities o Jupiter and earth are respectively 1.75 and 5.67. if a can jump to a height of 1500 cm, on earth how height can he jump on the surface of Jupiter, given that the height to which a man can jump is inversely proportional to the force of gravity?
7. The distance of the horizon at sea varies as the square root of the height of the eye above the sea level. When the distance is 14.4 kilometers, the height of the eye is 18 mts.. find in kms. the distance when the height of the eye is 8 mts. , and find in mts. The height of the eye when the distance is 7.2 kms.
8. The pressure of a certain mass of a gas varies inversely as its volume. When p(measured in kg. weight per square decimeter) is 20 then v( measured in cubic decimeter) is 450. find in kg. weight per square decimeter the pressure when the volume is 300 cubic decimetres. Also find volume when the pressure is 60 kg weight per square decimeter.

Answers.
1. 56 men
2. 5:3
3. 6kg.
4. 16:15
5. 10:15:12
6. 486 cm
7. 9.6km, 4.5 m
8. 30,150

[pagalneha]

CLOCKS.
• Here “#” means degrees.
• Normal clock has 60 divisions and each division =6 #
• In 60 minutes , minute hand moves 60 divisions whereas hour hand covers 5 divisions whereas hour hand covers 5 divisions, therefore minute hand overtakes 55 divisions in 60 minutes, so to overtake 1 division it needs 12/11 minutes.
• Minute hand covers 12 times the no. of divisions covered by hour hand in same time.
• Whenever u need to imagine; imagine the position of hand at exact hour, because u know the gap between the hour hand and minute hand=( hour*5) and minute hand is behind
• Angle between hands – (11m-60h)/2, If the angle calculated does not exists in the ans. options, then subtract your ans. from 360#
• Whatever position comes 1 in an hour, it takes place 11 times in 12 hrs.
• When u get ans. in decimals then remember base is 60.
• For every hour the gap is 60/13
• I f two watches move at different speeds, then they show the same time when the gap is 12hrs. or 720 minutes.
• We use the concept of ratio to find time.
In a normal watch hands coincide every 65 5/11 minutes. If it is written that hands are coinciding every 65 minutes. it means, true time is 65 minutes but watch is giving 65 5/11 minutes, so it is gaining 5/11 minutes every 65 minutes, therefore to calculate the variance , we find the number of time periods of 65 minutes and multiply it by 5/11

•

[pagalneha]

Q. when will there be an angle of 30# between 5 and 6?
Method- 5*5= 25
30/6= 5, 6 here means 6 divisions.
Now we get 2 answers-
i. 25-5=20 so 20*(12/11)
ii. 25+5=30 so 30*(12/11)

Q. what time between 5 and 6 in a railway clock both hands will be together.
Q. Between 7 and 8 , what time will the minute hand and the hour hand be pointing towards each other.
Q. Between 5 and 6 both the hour hand and the minute hand are equidistant from 5, but they r not together. What is the time?
Q. what is the change in angle from 3:10 to 3:20 pm.?
A train came at 4:15 and left between 4 and 5 and the angle remained same. What is the duration of the halt?
Q. I sent my servant between 3 and 4 and he came back between 4 and 5. hands had interchanged their positions. What time he came back and went out. How much time had the servant gone out?
Q. A watch looses 3 minutes every 2 hrs, it was set at 8:00 am on Sunday. When will it show the same time again.
Q. A watch gains 0.25% in the 1st week then losses 0.5% in the 2nd week. What variance it shows?
Q. In a wall clock, the minute hand is 6 inches long and hour hand is 4 inches long, what is the difference in area swept by both the hands between 2:15 and 4:15?
Q. At 8:00 am on Sunday watch A was behind by 10 minutes and watch B was ahead by 12 minutes. On Monday at 2:00 pm watch A was ahead by 5 minutes and watch B was behind by 6 minutes.
i. When watch A showed the correct time what was the time in watch A.
ii. When watch B showed the correct time what was the time in watch B.
iii. When did watch A and B show the same time?
iv. When watch A and B showed the same time, what was the time in A and B.

Q. A clock takes 6 sec. to strike 6, how much time it will take to strike 12?

[zeus]

thanks a ton for all the stuff neha.......its just the kinda material i'v been lookin for......

btw....would it be possible for u to provide with the ans for the first 2-3 posts so that we may verify...would be of great help if u have them around.

thanks yet again and keep up the good work....

waitin for the next dose!

adi

[pagalneha]

i'll try looking for them, but i'm not sure that i have them or not.

[pagalneha]

1.The convoy sum had appeared in CAT 96, I don’t have the ans, but the method is.
I…………………………..I-------------I
30kms. 10 of the convoy.

Total distance=30+10=40
40/10=4
Let the speed of convoy be “ x”.
4=10/(x-10)+10/(x+10)+10/(x-10)
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2. A,B, C
ans-
i. 75kms.
ii. 200kms.
iii. 8hrs.
iv. 25kms.

Method for the robbery sum.
12*120=1440
1440*(120+80)/[(120+80)+(120-80)]

here we were told to mug up this formula in this particular sum.
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Rest some of the answers are really difficult for me to find and just don’t feel like solving them all over again, maybe u all can discuss each answer, by posting ur ans. if they match they r all correct if not then we can go ahead with discussions. Now will try to posts all the ans. along with the questions.