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4 December, 18:08

It takes 36 minutes for 7 people to paint 4 walls. How many minutes dose it take for 9 people to paint 7 walls?

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  1. 4 December, 18:15
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    4 walls need 262 people/minutes (7) (36)

    1 wall takes 63 people/minutes (262/4)

    7 walls need 441 people/minutes (63) (7)

    9 people could do that in 49 minutes (441/9)
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