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~+ I( Z; K K- _
公仔箱論壇1 r( m, O0 V5 r8 E- B
[ 本帖最後由 carsonchan 於 2009-2-15 04:18 PM 編輯 ] |