apostolionut112 apostolionut112

14-11-2018
Mathematics

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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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mathstudent55 mathstudent55

14-11-2018

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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