Brain teaser for the week 20201017 每周烧次脑
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Difficulty level: ✮ ✮ ✮ ✮ ✮
John is 10 years old, and his mother is four times as old as he is. When John is 15 years old, how old will his mother be? (Assuming she is not dead.)
John 在10岁的时候他母亲岁数是他的4倍，那么 John 15岁时他母亲多少岁？
(a) 65
(b) 60
(c) 55
(d) 50
(e) 45
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next episode of brain teaser
答案下期公布
By the New Year's Day, top 3 players
will get a gift from us!
元旦前，年度前三高手将获得神秘礼物！
Answer to the last week 上期答案 Brain teaser for the week 20201010 每周烧次脑
If the client died in his sleep, there would be no way of knowing what he was dreaming. 如果这个客户在睡梦中死去，他就不会知道自己梦到了什么
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