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~公仔箱論壇' E. A, ` A% X3 J2 }6 g
& _' _! x' _2 d' ?' j# u公仔箱論壇[ 本帖最後由 carsonchan 於 2009-2-15 04:18 PM 編輯 ] |