This Coffee Brainteaser Has Stumped The Internet – But Can You Solve It?

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A coffee-related brainteaser posted on Twitter has left quite a few people stumped – but the answer is fairly simple once you look at it.

The puzzle was posted by Twitter user @_herbeautyxo, showing a jug of coffee being poured into a system of pipes.

Each leads to a different coffee cup that’s numbered. The question asks, which coffee cup will get filled first?

Here’s the puzzle in question. Can you work out the answer? 

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Plenty of people then had a go at trying to solve it, with varying success. We’ll post the solution below, but have a guess first.

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If you’re stumped, fear not. The answer is that only cup number 5 will fill. The reason is that if you look at the other pipes, you’ll see that they’re blocked off.

One smart-alec user on Twitter did point out, though, that cups 4, 7, and 9 will fill in that order once the coffee level on the floor starts rising – presuming you have an infinite supply of coffee.

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