Mathematics 002

002

Peter had 3 times much ping-pong ball as Gavin, if Gavin give Peter 6 ping-pong ball,and now Peter had 6 times much ping-pong ball ball as Gavin. How many balls does Gavin before?


Peter的乒乓球是Gavin的3倍，如果Gavin给Peter6个，那么，Peter是Gavin的6倍，Gavin原有多少个乒乓球？