Question

Andrei si mihai cantaresc impreuna 76 de kg. Mihai si Rares cantareste impreuna 78kg, iar Andrei si Rares cantaresc impreuna 82 kg. Cate kg cantareste fiecare

Answer 1

$a+m=76 \\ m+r=78 \\ a+r=82 \\ a+m+m+r+a+r=76+78+82 \\ 2(a+m+r)=236 \\ a+m+r=236:2=118 \\ r=118-76=42 kg Rares \\ a=118-78=40 kg Andrei \\ m=118-82=36 kg Mihai$