題目誤導人~
2 p/ U$ p3 `" A8 E: ^tvb now,tvbnow,bttvbowner 100
9 ~! g( b9 W( k" e% i: _& f' z公仔箱論壇owner's son 20tvb now,tvbnow,bttvb0 }& o/ r3 Y9 Y5 ^
each pay 40
/ a8 S: E7 ?; c! [# G9 Gtvb now,tvbnow,bttvb40*3 = 120
7 k( V8 i/ H2 ^( Y120(3 guys) - 20(owner's son) = 100 (owner) |