Răspuns :
Andrei are x lei
Ioana are 2x lei
2x-30=x+15
2x-x=15+30
x=45(lei are Andrei)
45x2=90(lei are Ioana)
Ioana are 2x lei
2x-30=x+15
2x-x=15+30
x=45(lei are Andrei)
45x2=90(lei are Ioana)
x-nr de bani ai Ioanei
y-nr de bani ai lui Andrei
x=2y
x-30=y+15
2y-30=y+15
2y-y=15+30
y=45 lei
x=2*45
x=90lei
y-nr de bani ai lui Andrei
x=2y
x-30=y+15
2y-30=y+15
2y-y=15+30
y=45 lei
x=2*45
x=90lei