x + y + z = 237
aceiasi cantitate k
x - k = 26 x = k + 26
y - k = 35 y = k + 35
z - k = 38 z = k + 38
----------------------------
x + y + z = 3k + 99
237 = 3k + 99
3k = 237 - 99 ; 3k = 138
k = 138 :3 = 46
x= 46 + 26 = 72 kg
y = 46 + 35 = 81 kg
z = 46 + 38 = 84 kg