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2 October, 02:21

It takes 20 minutes for 5 people to paint 5 walls. How many minutes does it take 9 people to paint 9 walls?

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  1. 2 October, 02:39
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    32 minutes.

    20 minutes for one person per wall would be 4 minutes per person per wall.

    5 x 4 = 20 minutes.

    Therefor, one person per wall per 4 minutes with 9 people and 9 walls would be 32 minutes.

    9 x 4 = 32 minutes.
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