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

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6

2

7

5

answer is C.

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Detailed Solution

Let

x

be the required number of days.
If the number of spiders is less than the number of days, so we have

1 ： 7 ∷ 7 ： x

If the number of webs is more, then the number of days is more So, we have

7 ： 1 ∷ 7 ： x

Spider: Days
Webs: Days

∴ The required number of days is

7

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