1. What world centre is in the middle of Paris, is at the end of the Eiffel Tower, and is involved in starting every race?
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2. With the three door numbers below, how many different three digit numbers can be produced?
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3. Alice regularly visits her grandfather on the 10th floor of an apartment building by going to the 9th floor and walking up a flight of stairs to the 10th floor. Last year she only took the elevator to the seventh floor, and walked up three flights of stairs. Why?
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4. What familiar phrase is represented by the arrangement of letters below?
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5. A dozen is 12, therefore, half a dozen is 6. Which would you prefer, half a dozen dozen £1 coins, or 6 dozen dozen £1 coins?
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6. What number is 20 less than five times itself?
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7.
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If twice ten are six of us,
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But six are just three,
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And nine are just four of us,
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Then what can we be?
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If you want more of us,
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Take ten which is three,
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Or twelve which is six of us,
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Now do you see?
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8. By what fractional part does four fourths exceed three fourths?
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