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~
2 E- F i: M- J" ~. ]2 L5.39.217.77tvb now,tvbnow,bttvb8 [+ b" G# V. B4 d2 n" k
[ 本帖最後由 carsonchan 於 2009-2-15 04:18 PM 編輯 ] |