Question

Suma de 5 lei este platita in monede de 50 bani si 10 bani,in total 18 monede.Cate monede sunt de fiecare fel.Va rog ajutatima...​

Answer 1

x= nr. monedelor de 50 bani

y= nr. monedelor de 10 bani

50x+10y= 500

x+y=18 => y=18-x

50x+10(18-x)=500

50x+180-10x=500 |-180

40x=320 |:40

x=8

y= 18-x= 18-8=10

Raspuns: nr monedelor de 50 bani= 8

nr monedelor de 10 bani= 10

Answer 2

Răspuns:

a=monede de 50 bani,b=monede de 10 bani

5 lei=500 bani

a+b=18=>b=18-a

50a+10b=500

50a+10(18-a)=500

50a+180-10a=500

40a=500-180

a=320:40

a=8 monede de 50 bani

b=18-8=10 monede de 10 bani

verificare

50·8+10·10=400+100=500 bani