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~5.39.217.77:8898/ \9 F2 X4 H, K% ^; N
% a% j x# W/ h3 }5 i[ 本帖最後由 carsonchan 於 2009-2-15 04:18 PM 編輯 ] |