Math Riddles

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When my father was 31 I was 8. Now he is twice as old as me. How old am I?
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A sphere has three, a circle has two, and a point has zero. What is it?
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Why is it easier to count cows than sheep?
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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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Take two numbers, such that the square of the first, plus the square of the second, shall equal 8; while the first, plus the product of the first and second, shall equal 6. What are the two numbers?
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81 x 9 = 801. What must you do to make the this equation true?
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