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~公仔箱論壇& p" n) F# Y+ d0 p! G% T# z
+ [: p# l0 a; a4 i) W2 P[ 本帖最後由 carsonchan 於 2009-2-15 04:18 PM 編輯 ] |