Gotchas 

What is it that goes up and goes down …

… but does not move?

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A farmer has 5 haystacks in one field and 4 haystacks in the other field.

How many haystacks would there be if they were combined in one field?

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What can go up a chimney down …

… but can't go down a chimney up?

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Someone purchases 1 for 38p, 23 for 76p and 102 for £1.14.

What are they buying?

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