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~tvb now,tvbnow,bttvb% X2 ^7 {, O2 E2 _8 r
公仔箱論壇6 Y A* H$ @- v4 C( Z/ `
[ 本帖最後由 carsonchan 於 2009-2-15 04:18 PM 編輯 ] |