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~5.39.217.779 s$ V- B2 j; e) G
公仔箱論壇 b# `8 d8 m. p$ k$ m
[ 本帖最後由 carsonchan 於 2009-2-15 04:18 PM 編輯 ] |