Four dwarfs would prepare firewood for Snow White in580 minutes. After an hour and a half, they recruited friends and finished preparing the wood for 280 minutes. How many dwarfs do they recruit?

Correct answer:

x =  3

Step-by-step explanation:

1.5·60·4 + 280·(x+4) = 580·4

280x = 840

x = 840/280 = 3

x = 3

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