Question

Pe un raft sunt 674 de mingi rosii, albastre si galbene. Mingi rosii si albastre sunt 435 iar albastre si galbene 372.                                                                                                                             Cate mingi de fiecare fel sunt?

Answer 1

r+a+g=674
r+a=435
a+g=372
435+g=674
g=239
a=372-239=133
r=435-133=302

Answer 2

r+a+g=674
r+a=435⇒g=674-435=239
a+g=372⇒r=674-372=302
si cele albastre=674-239-302=133