CAN you solve this tricky parking puzzle in less than 20 seconds? If so, you could have a higher-than-average IQ.

       Even those with a witty brain can get stumped on this challenging riddle as they might not be looking at it the right way.

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       Can you solve this tricky parking puzzle in less than 20 seconds? Credit: Twitter

       The puzzle is in fact a question from a primary school admission test in Hong Kong.

       It was designed for children aged around six who need to solve it in under 20 seconds.

       But although it's meant for six-year-olds, adults can struggle and immediately feel the need to find a sophisticated solution.

       The question illustrates a car park with six spaces.

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       Five of the empty spaces feature numbers, and the sixth has a car parked in it obscuring the number.

       The question is "what is the number of the parking space containing the car?"

       Can you solve it? Set your timer to 20 seconds and give it a go,

       You might spend a fair bit of time trying to work out the answer, but it's definitely a lot simpler than you might think.

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       To get to the bottom of this puzzle, no algebra or thinking of special sequences is required.

       All you need to do is perhaps think like a six-year-old and turn it upside down.

       One you flip the page you will come out with the answer - 87.

       The missing number is part of the ascending sequences of 86 to 91.

       Many people responded to the puzzle, thinking the answer would be 78, or 75 - even 45, but had these people simply flipped it upside down they would have guessed the right answer immediately.

       Want to have a go at a different maths puzzle?

       Try working out how many eggs are in the carton with this tricky riddle.

       If you are able to count all the eggs in the carton on time, you must be a true genius.

       But there's no need to panic if you couldn't figure it out, as it turns out only five per cent of people manage to solve it.