va rog raspunsul prin foto

tom: 36/5 (sau 7,20 kg)
jerry: 36/5 : 12/1 = 36/5×1/12 = 36/50 = 18/25 (sau 7,2:12=0,72 kg)
36/5 + 18/25 = 180/25+18/25 = 198/25 = 7,92 (sau 7,20+0,72=7,92)