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Riddles, one at a time

Twin Panels

How many TILES were changed?

Picture · Medium Challenge link
Answer

6

Dot, turn, colour, corners, shape and ring.

How many more km until the next mirror number?

Video · Medium Challenge link
Answer

11 km

The next mirror number is 30003, just 11 km on.

After how many hours are they the same height?

Video · Expert Challenge link
Answer

5 hours

After 5 h: A is 32 − 20 = 12 cm, B is 22 − 10 = 12 cm.

Move exactly one rod. What is the true equation?

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Answer

9 − 8 = 1

The top rod of the 7 turns the 3 into a 9.

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.

How Many Triangles?

How many triangles are in the figure?

Picture · Medium Challenge link
Answer

15

Single pieces plus every combined shape: 15 in all.

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