Question

ANDREI, MARIN si ION au impreuna 36 lei. Daca ANDREI si MARIN au impreuna 26 lei, iar MARIN si ION au impreuna 24 lei, cati lei are fiecare baiat?

Answer 1

A+M+I=36
A+M=26
M+I=24
A+2M+I=50 de unde rezulta ca Marin are 50-36=14 lei
Andrei=36-14=12lei
Ion=24-14=10lei

Answer 2

a+m+i=36
a+m=26
m+i=24

36-26=10 ion
m+10=24=>m=24-10=>m=14 marin

a+14=26=>a=26-14=>a=12 andrei

proba: 12+14+10=36