cost 15 to make the shoes, gave the boy 29 for change, and need 29 more to pay back the nieghborhood, so 15+29+29= 73. simple ,math problem. much easier than calculus~+ x# O H* T+ \% C# ?# i5 R$ M
+ G7 w& n6 }& d, h$ e$ X5 U4 Stvb now,tvbnow,bttvb[ 本帖最後由 carsonchan 於 2009-2-15 04:18 PM 編輯 ] |