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

Question:
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

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.