Eight of the very hardest maths puzzles we could find

In the past month, the world has been gripped by a series of maths and logic puzzles that were originally set for children.

First came the parked car puzzle which was set as a test for primary school children in Hong Kong but many adults still found tricky to solve. Then came Cheryl's birthday, set for 15 to 16-year-olds in Singapore but seemingly impossible for anyone to solve. And finally this week came the rod and string conundrum which stumped 96 per cent of top maths students in the US when it first appeared back in the 1990s.

Because all have proved so popular, and many of you seem to have already solved the original three, we've pored through the records to find eight more puzzles to leave you chewing your pencil and pulling out your hair.

Let us know how you get on...

1. How to beat Roger Federer at Wimbledon

Thanks to a set of temporary magical powers you are in the final of the Wimbledon tennis championships up against seven-time winner Roger Federer. Your powers cannot last for the whole match and you must therefore choose the optimum time for them to run out. What is the score that gives you the maximum chance of winning?

Question via Peter Winkler.

Solution can be found here.

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