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Chain Rule - General Aptitude

Q1:

In a dairy farm, 40 cows eat 40 bags of husk in 40 days. In how many days one cow will eat one bag of husk?

A 1

B
1
40

C 40

D 80

ANS:C - 40

Let the required number of days be x. Less cows, More days (Indirect Proportion) Less bags, Less days (Direct Proportion)

Cows 1 : 40 :: 40 : x
Bags 40 : 1
 1 x 40 x x = 40 x 1 x 40  x = 40.