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March 26, 2017

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two sisters together have 20 books. if the younger sister lost 3 books and the older sister doubled the number she has, they would have a total of 30 books. How many books does each have?

  • algebra - ,

    The older has 26 and the younger 4

  • algebra - ,

    Now:
    older sister --- x
    younger sister --- 20-x

    new scenario:
    older sister --- 2x
    younger --- 20-x - 3 = 17-x

    2x + 17-x = 30
    x = 13

    so now the older has 13, the younger has 7

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