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9 l# s# m8 o5 E1 I) N4 x. A* U+ s
. {5 n: W/ `, f, }- u
[ 本帖最後由 carsonchan 於 2009-2-15 04:18 PM 編輯 ] |