Question

Trei elevi de clasa 5 s3 cantar3sc doi cate doi si are 104 kg, 107 kg, 109 kg .
Cat cantares fiecare el3v

Answer 1

a+b=104

b+c=107

a+c=109

adunam relatiile:

2a+2b+2c=104+107+109=320⇒a+b+c=160

a+b=104⇒104+c=160⇒c=160-104=56

a+c=109⇒a=109-56=53

b+c=107⇒b=107-56=51

V:56+53+51=160