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~" r! N+ S/ Y+ V0 S) D# p; z
" K, M( ]" `' }. b8 E, C[ 本帖最後由 carsonchan 於 2009-2-15 04:18 PM 編輯 ] |