Question

Suma de 2600 lei a fost platita folosind bacnote de 50 lei si bacnote de 100 lei.Stiind ca s.ai folosit 34 de bacnote ,afla cate bacnote au fost din fiecare fel ( metoda algebrica)

Answer 1

notam: 50 lei =a  ; 100 lei=b
50a+100b=2600
a+b=34=> a=34-b

50(34-b)+100b=2600
1700-50b+100b=2600
50b=900
b=18 bancnote de 100 lei

a=34-18
a=16 bancnote de 50 lei

Answer 2

a+b=34=>a=34-b
50a+100b=2600

50(34-b)+100b=2600
1700-50b+100b=2600
50b=2600-1700
b=900:50
b=18 bacnote de 100 lei
a=34-18=16 bavnote de 50 lei