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27 January, 01:26

Ana are 25 euro in monede de 2 euro si bacnote de 5 euro. Cate monede are Ana, daca in total are 8 bacnote si bacnote?

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  1. 27 January, 01:37
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    x = numărul de monede de 2 euro

    y = număr de bancnote de 5 euro

    2x + 5y = 25

    x + y = 8

    y = 8 - x

    2x + 5 (8 - x) = 25

    2x + 40 - 5x = 25

    -3x = - 15

    x = 5

    x + y = 8

    5 + y = 8

    y = 3

    numărul de monede de 2 euro = 5

    număr de bancnote de 5 euro = 3
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