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2014-06-08T12:09:39+03:00
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)
3 4 3
2014-06-08T12:10:54+03:00
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