Quantitative Aptitude :: Chain Rule - Discussion

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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