Brain teaser for the week 20201024 每周烧次脑
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There are nine coins that are identical in appearance. One weighs more than the others, which have equal weight. With a balance scale to determine the coin that is heavier in only two weighings, how many coins on each side of the balance scale would you weigh first?
有9个外观相同的硬币，其中8个重量相同，另1个比这8个略重。如果用天平称重两次找出这个略重的硬币，那么，第一次称重要在天平的每一侧各放多少个硬币？
(a) 1 vs. 1
(b) 2 vs. 2
(c) 3 vs. 3
(d) 4 vs. 4
(e) none of these
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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 20201017 每周烧次脑
(e) 45
If John =10, then his mother is 40. When John is 15, he is 5 years older. So, his mother must be 5 years older, and then is 45.
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