Puzzle

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Trefoil Puzzle #146

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

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Trefoil Puzzle #145

There is a cage at the zoo that holds a variety of jungle animals and creatures. In this cage, there are 11 heads and 20 feet. There are twice as many jungle creatures with four feet as there are jungle creatures with two feet. How many creatures of each kind are in the cage?

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Trefoil Puzzle #144

It takes Sandy three hours to paint a fence, and it takes Claude six hours to complete the same job. How long would it take both of them working together at their normal paces to complete the same job?

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Trefoil Puzzle #143

There are two books standing side by side on a shelf, each consisting of exactly 100 pages. The book on the left is upside-down. If you add the page number at the extreme left-hand side of the left-hand book to the page number at the extreme right-hand side of the right-hand book, what is the total?

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Trefoil Puzzle #141

Using one set of letters in the same order, can you fill in the blanks and make a normal sentence?
A _o_a_l_ doctor had _o _a_l_ and therefore, was _o_ a_l_ to operate.

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Trefoil Puzzle #138

This is a most unusual paragraph. How quickly can you find out what is so unusual about it? It looks so ordinary you’d think nothing was wrong with it and in fact, nothing is wrong with it. It is unusual though. Why? Study it, think about it, and you may find out. If you work at it for a bit it will dawn on you. So jump to it and try your skill at figuring it out. Good luck!

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Trefoil Puzzle #136

There are three extremely bright men seeking the hand of Ms. Barrett. Candy loves her men smart, but cannot decide which one of the three men is the smartest. Consequently, she proposes a test. Ms. Barrett places a mark on each man’s forehead and tells them that each of them has either a blue mark or a red mark. She instructs them to raise their hand if they see a blue mark on either of the other two. The first man to determine what color his mark is, and explain how he arrived at that conclusion will have her hand in marriage. Each man raised his hand, and a few moments later, one of them had the answer. What color was the winner’s mark and how did he know?