Question

andrei si bogdan cantaresc impreuna 76 de kg ,bogdan si cristi cantaresc impreuna 78 de kg,iar andrei si cristi cantaresc impreuna 82 de kg.cate kg cantareste fiecare.

Answer 1

a+b=76
b+c=78
a+c=82
a+b+b+c+a+c=76+78+82
2(a+b+c)=236
a+b+c=236:2=118
c=118-76=42 kg cantareste Cristi
a=118-78=40 kg cantareste Andrei
b=118-82=36 kg cantareste Bogdan