Question

3 cosuri cu mere cantaresc in total 81 de kg.primele 2 cosuri cantaresc 51 de kg iar ultimile 2 42. Stiind ca un cos gol are 2kg aflati cate kg are fiecare cos cu mere !??

Answer 1

a+b+c=81
a+b=51

c=81-51=30kg
30-2=28kg mere

b+c=42
b=42-30
b=12
12-2=10kg mere

a=51-12
a=39kg
39-2=37kgmere

Answer 2

1. Cat cantareste al treilea cos ?
  81-51=30
2. Cat cantareste primul cos ?
  81-42=39
3. Cat cantareste al doilea cos ?
  51-39=12
4. Cate kg de mere are primul cos ?
  39-2=37
5. Cate kg de mere are al doilea ?
  12-2=10
6. Cate kg de mere are al treilea cos ?
  30-2=28 

R: 37; 10; 28.