Question

Andrei si Mihai cantaresc impreuna 76Kg ,Mihai si Rares cantaresc impreuna 78kg ,iar Andrei si Rares cantaresc impreuna 82kg. Cate kilograme cantaresc fiecare?

Answer 1

A+M=76
M+R=78
A+R=82
_______(+)
A+M+M+R+A+R=2(A+M+R)=76+78+82=236
A+M+R=236:2=118
R=118-76=42
M=118-82=36
A=118-78=40