Question

3 piese de metal cantaresc impreuna 155 kg prima cu 28 mai grea decit a 2 iar a 3 cu 22kg mai frea decit a doua cit cintareste fiecare piesa?

Answer 1

a, b, c masele pieselor
a+b+c=155
a=b+28
c=b+22
inlocuim in prima relatie
b+28+b+b+22=155
3b+50=155
3b=105
b=35
a=35+28, a=63
c=35+22, c=57
piesele cantaresc 63kg, 35kg, 57kg

Answer 2

a+b+c=155
a=28+b
c=22+b
28+b+b+22+b=155
3b+50=155
3b=155-50
3b=105
b=105÷3
b=35
a=28+35
a=63
c=22+35
c=57
verificare
63+35+57=155