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Can You Make It Through This 20-Step Calculation?

One wrong answer and you lose.

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There are 20 steps in this maths problem, and each one leads on from the last. Most of it is pretty simple, but if you get one wrong, the quiz will end – so think carefully before you answer! Good luck.

Warner Bros. Pictures

Kelly Oakes is science editor for BuzzFeed and is based in London.

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