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Riddles, one at a time

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.

Colours mix like paint. Which door does the beam light, and in what colour?

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Answer

D, ORANGE

Mirrors turn it; red and yellow panes make orange.

A melon weighs 2 kg plus one third of its own weight. How much does the melon weigh?

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Answer

3 KG

The 2 kg must be the other two thirds, so one third is 1 kg and the melon is 3 kg.

Full explanation on the blog

A lighthouse flashes evenly. From the 1st flash to the 6th takes 5 seconds. How long from the 1st flash to the 11th?

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Answer

10 seconds

Flash 1 to flash 6 is 5 gaps, so each gap is 1 second. Flash 1 to 11 is 10 gaps.

Which object fits all three clues?

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Answer

Pencil

It gets shorter as it works, leaves a grey trail and has lead inside: B.

Which colour hides under the ? card?

Video · Medium Challenge link
Answer

B RED

Magenta stops green, yellow stops blue: red is left.

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