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~7 M; c% k f. ~6 p9 P5 ~) H
tvb now,tvbnow,bttvb \0 [$ Q5 R6 U4 |
[ 本帖最後由 carsonchan 於 2009-2-15 04:18 PM 編輯 ] |