Puzzle #35, #36, #37, #38, #39: A bunch of brain teasers
21 December 2019
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From New Scientist #3261, 21st December 2019 [link] [link]
Puzzle #35: Christmas gifts
Q1: By the twelfth day of Christmas, my true love has given me 12 partridges in a pear tree. But which gifts have I received the most of?
Q2: I want to give all the gifts back. Starting on 26 December 2019, I am going to give one of them to my true love every day. On which date will I give them my final gift?
Puzzle #36: All squares (1)
I met Natalie the other day. She wasn’t prepared to tell me her age, but she did tell me that in the year N², she will turn N years old.
In what year was she born?
Puzzle #37: All squares (2)
Can you work out (68² – 32²)/(59² – 41²) without using a calculator?
And can you do it without having to square any of the numbers?
Puzzle #38: Meaningful matches (1)
The figure below has four equilateral triangles. Move two matchsticks to get only three equilateral triangles.
Puzzle #39: Meaningful matches (2)
The figure below is composed of 29 matchsticks. Move two matchsticks to get a correct multiplication result.
[puzzle#35] [puzzle#36] [puzzle#37] [puzzle#38] [puzzle#39]