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~
7 k ~# s2 X" z* T$ q$ \, e& c公仔箱論壇TVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。$ j1 A" a' Q( `( Y+ L: d7 t
[ 本帖最後由 carsonchan 於 2009-2-15 04:18 PM 編輯 ] |
發表於 2009-2-15 04:12 PM
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