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250 calls in 10 hours = _ calls in 15 hours

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250 calls in 10 hours = 375 in 15 hours

375 Is the answer, a quick way I did it was to divide 10 and 250 by two. 5 and 125, since 10 hours is 250 calls,half of that is 125 calls in 5 hours. 10+5 =15, 125+250=375.

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