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~tvb now,tvbnow,bttvb, u3 f3 ]7 d% ^* i
1 W b. \' E" f+ t, r$ d. v+ Otvb now,tvbnow,bttvb[ 本帖最後由 carsonchan 於 2009-2-15 04:18 PM 編輯 ] |