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, z N- v# ~& U0 N3 a0 L& l
9 x. w: E4 }6 A {tvb now,tvbnow,bttvb[ 本帖最後由 carsonchan 於 2009-2-15 04:18 PM 編輯 ] |