Brain teaser for the week 20200822 每周烧次脑
Difficulty level: ✮ ✮ ✮ ✮ ✮
Rearranging the letters MEANYRG would give you the name of:
MEANYRG 这组字母，将之重新排列后，你能得到以下哪一种结果？
(a) an animal 一种动物
(b) a state 一个州的名字
(c) a city 一个城市的名字
(d) an ocean 一片海洋的名字
(e) a country 一个国家的名字
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答案下期公布
Answer to the last week 上期答案 Brain teaser for the week 20200815 每周烧次脑
4,950
This is extremely tricky. Write the numbers as:
1 + 2 + 3 + 4 +…+ 99 = N, and then write the numbers below that in reverse:
99 + 98 +97 + 96 +…+ 1 = N
Adding both sums we get 100 + 100 + 100…(99 times)
This is just 99 × 100, which is just 2N.
So N = 50 × 99 = 99 × 100/2 = 4,950
这题的解法有很多，这里提供一种解法：
假设 1+2+3...+99=N
然后颠倒顺序，再写一次，99+98+97...+1=N，
两者相加，则是 100+100+100...+100=2N
一共是99个100
那么 N=99x100/2=4950
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