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Riddles, one at a time

Which word fills the gap?

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Answer

MILL

HILL to MILL changes H to M; MILL to MILK changes L to K.

After how many hours are they the same height?

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Answer

2 hours

After 2 h: A is 20 − 8 = 12 cm, B is 15 − 3 = 12 cm.

Join 3, 6, 9... in order. What appears?

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Answer

C LANTERN

3 to 45 traces a lantern; the rest are decoys.

Which tokens pay 18 with the fewest tokens?

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Answer

9 + 9

Just 2 tokens. Biggest first, 16 + 1 + 1, needs 3.

Stack the Stones

Which number belongs on the top brick?

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Answer

44

20 - 9 = 11, 13 + 11 = 24, then 24 + 20 = 44.

Which tokens pay 11 with the fewest tokens?

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Answer

5 + 6

Just 2 tokens. Biggest first, 9 + 1 + 1, needs 3.

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