有 three guys
they go to canteen and eat
total is $ 25
everyone pay $10 ($30)
找番$5
they give tips $2
每人take 番$1(so everyone pay $9)
9x3=27 +2
=29
點解
收錄日期: 2021-05-03 04:48:25
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20081108000051KK00280