Q.1

If 15 toys cost Rs, 234, what do 35 toys cost?

Explanation :
Let the required cost be Rs. x.
Then, More toys, More cost (Direct Proportion)
```
15 : 35 : : 234 : x 
(15 * x) = (35 * 234) 
 x=(35 * 234)/15 = 546
```
Hence, the cost of 35 toys is Rs. 546.

Q.2

If 36 men can do a piece of work in 25 hours, in how many hours will 15 men do it ?

Explanation :
. Let the required number of hours be x.
Then, Less men, More hours (Indirect Proportion)
```
15 : 36 : : 25 : x 
(15 x x) = (36 x 25) 
(36 x 25)/15 = 60
```
Hence, 15 men can do it in 60 hours.

Q.3

If the wages of 6 men for 15 days be Rs.2100, then find the wages of for 12 days.

Explanation :
Let the required wages be Rs. x.
More men, More wages (Direct Proportion)
Less days, Less wages (Direct Proportion)
Men 6: 9 : :2100:x
Days 15:12
Therefore (6 * 15 * x)=(9 * 12 * 2100)
x=\(\frac{(9 * 12 * 2100)}{(6 *15)}\)=2520
Hence the required wages are Rs. 2520.

Q.4

If 20 men can build a wall 66 metres long in 6 days, what length of a similar can be built by 86 men in 8 days?

Explanation :
Let the required length be x metres
More men, More length built (Direct Proportion)
Less days, Less length built (Direct Proportion)
Men 20: 35
Days 6: 3 : : 56 : x
Therefore (20 x 6 x x)=(35 x 3 x 56)
x=(35 x 3 x 56)/120=49
Hence, the required length is 49 m.

Q.5

If 15 men, working 9 hours a day, can reap a field in 16 days, in how many days will 18 men reap the field, working 8 hours a day?

Explanation :

Q.6

If 9 engines consume 24 metric tonnes of coal, when each is working 8 hours day, bow much coal will be required for 8 engines, each running 13hours a day, it being given that 3 engines of former type consume as much as 4 engines of latter type?

Explanation :
. Let 3 engines of former type consume 1 unit in 1 hour.
Then, 4 engines of latter type consume 1 unit in 1 hour.

Q.7

. A contract is to be completsd in 46 days sad 117 men were said to work 8 hours a day. After 33 days, (4/7) of the work is completed. How many additional men may be employed so that the work may be completed in time, each man now working 9 hours a day?

Explanation :

Q.8

A garrison of 3300 men had provisions for 32 days, when given at the rate of 860 gns per head. At the end of 7 days, a reinforcement arrives and it was for that the provisions wi1l last 17 days more, when given at the rate of 826 gms per head, What is the strength of the reinforcement?

Explanation :
The problem becomes:
3300 men taking 850 gms per head have provisions for (32 - 7) or 25 days, How many men taking 825 gms each have provisions for 17 days?
Ration 825 : 850
Days 17: 25 } : : 3300 : x
(825 x 17 x x) = 850 x 25 x 3300 or x = (850 x 25 x 3300)/(825 x 17)=5000
Strength of reinforcement = (5500 - 3300) = 1700.

Journey of a Thousand Miles begins with One Click!!!

CHAIN RULE

UPSCFEVER - POPULAR PAGES

Join The Movement

Discussions and Comments