Chain Rule - Quantitative Aptitude (MCQ) questions for Q. 755

Q.  If a certain number of people can dig earth 100m deep, 25m long, and 30m broad in 12 days, then find the number of days the same number of people will require to dig earth 75m deep, 20m long and 50m broad.
- Published on 06 Jul 15

a. 12
b. 18
c. 6
d. 1

ANSWER: 12
 
More number of days means – more length, more depth and more width. Hence, it’s a direct proportion.
(100*25*30):(75*20*50)::12:x
75000:75000::12:x
x = 12

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