(from Boris Kordemsky - The Moscow Puzzles)
Thursday, December 31, 2020
Monday, December 21, 2020
Sunday, December 20, 2020
Thursday, December 17, 2020
12 Days of Christmas
If we choose three gifts randomly, what is the probability that they are all birds of the same kind?
Saturday, December 5, 2020
Friday, December 4, 2020
Average Pages
Mother asked Vera to type a manuscript. Vera decided: "I will type an average of 20 pages a day."
She typed the first half of the manuscript rather lazily, at 10 pages a day. To make up for it, she typed the second half at 30 pages a day.
"See, I did average 20 pages a day," Vera concluded. "Half of 10 + 30 is 20."
"No, you didn't," her mother said.
Who was right?
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