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Literina a economisit 64 lei in bancnote de 1 leu si de 5 lei.stiind ca in total are 20 de bancnote, afla cat valoreaza bancnotele de 5 lei.folositi metoda falsei ipoteze.

Răspuns :

x-nr bancnotelor de 1 leu
y-nr bancnotelor de 5 lei

x+y=20
x=20-y

x+5y= 64
20-y +5y=64

4y=64-20
4y=44
y=11 bancnote de 5 lei

20-11=9 bancnote de 1 leu