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57. ((5X8)/4)(5+7)=120, (5X8)/4X5)+7=2+7=9, (5X8)/(4X5+7)=1.481... Take your pick.

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Without any parentheses, the order of mathematical operations is -

Multiplication, Division, Addition and Subtraction.

Following these mandates, 57 is the proper answer.

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16y ago

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