Răspuns :
Metoda comparației
7 kg de mere..........9 kg de piersici...........50 RON
13 kg de mere.........9 kg de piersici...........62 RON
6 kg de mere...........----------------------............12 RON
1 kg de mere............12 RON : 6 = 2 RON
7 × 2 RON = 14 RON...........9 kg de piersici........50 RON
9 kg de piersici..........50 RON - 14 RON = 36 RON
1 kg de piersici...........36 RON : 9 = 4 RON