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$ C ?) ~# k! \4 h
: [3 |, ~3 e9 I5 @( F! h2 Y! T% E- Q[ 本帖最後由 carsonchan 於 2009-2-15 04:18 PM 編輯 ] |