when is Cheryl’s birthday? Tricky math problem goes viral - 未名空间MITBBS历史存档

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when is Cheryl’s birthday? Tricky math problem goes viral

when is Cheryl’s birthday? Tricky math problem goes viral# WaterWorld - 未名水世界

m*22015-04-15 07:04

1 楼

Albert and Bernard just became friends with Cheryl, and they want to know
when her birthday is. Cheryl gives them a list of 10 possible dates.
May 15
May 16
May 19
June 17
June 18
July 14
July 16
August 14
August 15
August 17
Cheryl then tells Albert and Bernard separately the month and the day of her
birthday respectively.
Albert: I do not know when Cheryl’s birthday is, but I know that Bernard
does not know too.
Bernard: At first I don’t know when Cheryl’s birthday is, but I know now.
Albert: Then I also know when Cheryl’s birthday is.
So when is Cheryl’s birthday?

S*12015-04-15 07:04

2 楼

This is too easy. May 19

【在 m**2 的大作中提到】

: Albert and Bernard just became friends with Cheryl, and they want to know
: when her birthday is. Cheryl gives them a list of 10 possible dates.
: May 15
: May 16
: May 19
: June 17
: June 18
: July 14
: July 16
: August 14

A*i2015-04-15 07:04

3 楼

lz你这英语水品令人着急啊。。
而且你还把日期都写错了。。。
按原题，确实是非常简单就能推出是May 19，按你给的这日期，15， 17， 18，19都有
可能。。
故意的吧？

【在 m**2 的大作中提到】

S*12015-04-15 07:04

4 楼

You are wrong.
This is not as simple as you think. You need to use all 3 statements.
There is nothing wrong with LZ's English, may be it is not very American,
but grammar is correct.

【在 A*****i 的大作中提到】

: lz你这英语水品令人着急啊。。
: 而且你还把日期都写错了。。。
: 按原题，确实是非常简单就能推出是May 19，按你给的这日期，15， 17， 18，19都有
: 可能。。
: 故意的吧？

A*i2015-04-15 07:04

5 楼

我说的是按原题，Singapore的那版，lz这个是自己编的题目，过过做发考题的瘾

【在 S*******1 的大作中提到】

: You are wrong.
: This is not as simple as you think. You need to use all 3 statements.
: There is nothing wrong with LZ's English, may be it is not very American,
: but grammar is correct.

S*12015-04-15 07:04

6 楼

It seems to me LZ copied the original version word by word.

【在 A*****i 的大作中提到】

: 我说的是按原题，Singapore的那版，lz这个是自己编的题目，过过做发考题的瘾

A*i2015-04-15 07:04

7 楼

好吧。。第一个clue看错了。。确实是july 16

【在 S*******1 的大作中提到】

: It seems to me LZ copied the original version word by word.

m*22015-04-15 07:04

8 楼

你着什么急啊？:) 我全抄的。那你赖人家Singapore教育部英文不好？

【在 A*****i 的大作中提到】