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' \4 I' M* {& J6 O2 m7 c
: \) w/ m5 W; g/ K& W+ J5.39.217.77[ 本帖最後由 carsonchan 於 2009-2-15 04:18 PM 編輯 ] |