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### Discussion :: Chain Rule

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

2.  A. 1 B. $$\frac { 7 } { 2 }$$ C. 7 D. 49

Answer : Option C

Explanation :

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.

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