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25 August, 14:28

Dan has 20 books in his library. He bought several books at a yard sale over the weekend. He now has 71 books in his library. How many books did he buy at the yard sale?

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Answers (2)
  1. 25 August, 15:32
    0
    Hi!

    He bought 51 books at the yard sale.

    71 - 20 = 51

    cheers!
  2. 25 August, 16:43
    0
    To find the number of books he bought we need to do this:

    # of books bought at yard sale = # of books after yard sale - # of books before yard sale

    # of books bought at yard sale: x (we don't know what is yet)

    # of books after yard sale: 71 books

    # of books before yard sale: 20 books

    Now set up the equation to solve: x = 71 - 20

    Solve the equation:

    71 - 20 = 51

    so x = 51

    Dan bought 51 books at the yard sale.
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