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08-06-2017
Mathematics

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It takes 45 minutes for 4 people to paint 5 walls.How many minutes does it take 6 people to paint 4 walls?

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Аноним Аноним

08-06-2017

45 min. - 4 peoples - 5 walls
? min. - 6 peoples - 4 walls
-------------------------------------------
180 min. - 1 man - 5 walls ⇒
36 min. - 1 man - 1 wall ⇒
6 min. - 6 peoples - 1 wall ⇒
24 min. - 6 peoples - 4 walls (answer)

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