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【整理转载】一百个大学生就有99个回答错误的小学算术题

其实我知道这个问题在网上流传许久,只是有点好奇出题人到底是谁?
何以出一道模棱两可可说是没有答案的问题给学生作答呢?
大家一块儿来讨论讨论吧!

内容如下~

有个顾客到王老板的店里买了件礼物。
这礼物成本是18元,标价是21元。

顾客掏出100元付钱,当时王老板没有零钱,
于是用那100元向街坊换了100元的零钱,找给顾客79元。

后来街坊发现那100元是假钞,王老板无奈还了街坊100元。

* 请问王老板在这次交易中到底损失了多少钱??

(嘿!别小看这小小的问题,这可能会考倒你喔!)
好啦!问题来了,请好好思考一下吧!

For the benefit of those who find the above to be alien hieroglyphics,
Primary School maths
question that 99 out of 100 uni students answer wrongly.

A young man wants to buy a gift at Mr. Wang's shop.
The item's cost price is $18, while the selling price is $21.

The young man pays with a $100 bill, but Mr. Wang has no change.
Mr. Wang then goes to a nearby shop to change $100 of small notes, and returns the young man $79.

Subsequently, the nearby shop finds the $100 to be counterfeit, so Mr. Wang has to return the shop $100.

* How much did Mr Wang lose?