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25 June, 17:55

Shelf A had 40 books and Shelf B had 16 books. After Katrina borrowed an equal number of books from Shelf A and Shelf B, there were 3 times as many books on Shelf A than Shelf B. How many books did Katrina borrow altogether?

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  1. 25 June, 18:20
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    8 books; 4 from each shelf

    Step-by-step explanation:

    let x represent equal number of books from each shelf

    from shelf A = 40 - x

    from shelf B = 16 - x

    shelf A has 3 times as many books than shelf B

    3 (16 - x) = 40 - x

    48 - 3x = 40 - x

    48 - 40 = - x + 3x

    8 = 2x

    x = 4

    altogether she borrowed 4 + 4 = 8 books
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