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Chain Rule - General Aptitude

Q1:

If 7 spiders make 7 webs in 7 days, then 1 spider will make 1 web in how many days?

A 1

B
7
2

C 7

D 49

ANS:C - 7

Let the required number days be x. Less spiders, More days (Indirect Proportion) Less webs, Less days (Direct Proportion)

Spiders 1 : 7 :: 7 : x
Webs 7 : 1
 1 x 7 x x = 7 x 1 x 7  x = 7.