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~
# B( _( g! J: o; ]' _" i公仔箱論壇
. R2 N* a# Q+ Q0 L+ V" ktvb now,tvbnow,bttvb[ 本帖最後由 carsonchan 於 2009-2-15 04:18 PM 編輯 ] |