Chain Rule - Quantitative Aptitude (MCQ) questions for Q. 728

Q.  A military camp has a food reserve for 250 personnel for 40 days. If after 15 days 50 more personnel are added to the camp, find the number of days the reserve will last for?
- Published on 06 Jul 15

a. 20
b. 36
c. 25
d. 42

ANSWER: 25
 
As the camp has a reserve for 250 personnel that can last for 40 days, after 10 days the reserve left for 250 personnel is for 30 days. Now 50 more personnel are added

in the camp.

Hence, the food reserve for 300 personnel will last for:

250:300::x:30 ……..(it is an indirect proportion as less men means more days)
x = (250*30)/300
x = 25 days

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