Răspuns :
Răspuns:
a+b=400=>a=400-b
4a+6b=1950
4(400-b)+6b=1950
1600-4b+6b=1950
2b=1950-1600
b=350:2=>b=175 bilete de 6 lei
a=400-175=>a=225 bilete de 4 lei
verificare:
175+225=400 bilete
4·225+6·175=900+1050=1950 lei
Răspuns:
a+b=400=>a=400-b
4a+6b=1950
4(400-b)+6b=1950
1600-4b+6b=1950
2b=1950-1600
b=350:2=>b=175 bilete de 6 lei
a=400-175=>a=225 bilete de 4 lei
verificare:
175+225=400 bilete
4·225+6·175=900+1050=1950 lei