Multiple-step problems

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Question description

Jon bought 3 boxes of greeting cards.Each box has 8 card. He sent out 20 cards which shows one way to find how many cards are left ?. 

A.Multiply 3 by 8 and than subtract 20.    C.Multiply 5 by 8 and then add 20

B.Multiply 3 by 20 and than subtract 8.     D.Multiply 3 by 8 and then add 20.

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