Răspuns:
7ct + 3c + 2p = 175
9c + 5p = 230
8c + 10p = 140
140 = ( 175 - 3c ) + 8p => 175 - 140 = 3c + 8p = 35 =>
230 = 10p : 2 + 9c => 9ct > 5 p =>
APLICAM COMUTATIVITATEA!
7c + 3c + 2p = ( 7 + 3 + 2 ) * ( ct + c + p) =>
175 : 7 : 5 = 25 : 5 = ct + c + p