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,bttvb3 k: Z1 Y7 l S2 p; C
os.tvboxnow.com" |8 t7 F) U* v: r) k* ?4 E
[ 本帖最後由 carsonchan 於 2009-2-15 04:18 PM 編輯 ] |