Math Riddles

 
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Question: Queens can move horizontally, vertically and diagonally any number of spaces as illustrated. One piece 'attacks' another if it moves to the same tile that the other piece is on. How can you arrange eight queens on the board so they cannot attack each other?

Hint: Four must go on black and four on white.

Answer: Here are the two solutions. This is usually solved with guess and check although using logic may be faster. We know that each queen must be in it's own row vertically and horizontally. We also know that 4 of the queens must be on white and 4 on black. This is true because with 4 queens on the same color all of the rest of that color is venerable to attack. (It could be done with math).

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Question: Why does the second shape have an open block when the first shape does not?

Answer: The two triangles have different slopes so in the second shape the two triangles cause the shape to bulge out to account for the extra square unit.

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Question: Which is correct, 9 and 5 is 13 or 9 plus 5 is 13?

Hint: What is 9 plus 5?

Answer: Neither. 9 and (plus) 5 is 14, not 13.

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Question: If you have 30 white socks, 22 black socks, and 14 blue socks scattered across the floor in the dark, how many would you have to grab to get a matching pair?

Answer: 4. Once you grab 4 you will definitely have 2 of the same color.

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Question: As I was going to St. Ives,
I met a man with seven wives,
Each wife had seven sacks,
Each sack had seven cats,
Each cat had seven kits:
Kits, cats, sacks, and wives,
How many were there going to St. Ives?

Hint: Who is going to St. Ives?

Answer: 1, the only person that is assumed to be going to St. Ives is the narrator. But the following answers can be found if looking at the question in other ambiguous ways: 2802, 2800, 0, 2, 2753, 7, and 9.

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