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Riddles, one at a time

I am a 4-digit number. My first digit is twice my last. My second digit is my first and last added together. All my digits add up to 20, and I am odd. What number am I?

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Answer

6923

Call the last digit x: the digits are 2x, 3x, 20 - 6x and x. x can only be 1, 2 or 3; 1 breaks the third digit and 2 makes it even, so x = 3: 6923.

A pan holds 2 flatbreads. Each side needs 1 minute. How few minutes can it take to cook 3 flatbreads on both sides?

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Answer

3 minutes

Minute 1: A and B. Minute 2: A's other side and C. Minute 3: the other sides of B and C.

Which of the four words types the BIGGEST number?

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Answer

WORD

WORD types 9673, ahead of WEST 9378, YEAR 9327 and WAVE 9283.

I am a three-digit number. My three digits are all different, and they multiply to 6. I am even, and I am less than 200. What number am I?

Text · Medium Challenge link
Answer

132

Different digits that multiply to 6 can only be 1, 2 and 3. Below 200 means starting with 1: 123 or 132. Only 132 is even.

Which tokens pay 11 with the fewest tokens?

Video · Hard Challenge link
Answer

5 + 6

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

Which tokens pay 14 with the fewest tokens?

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Answer

7 + 7

Just 2 tokens. Biggest first, 10 + 1 + 1 + 1 + 1, needs 5.

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