Just 10 percent of people can solve this Harvard puzzle

This fiendishly difficult brainteaser requires a genius IQ and is reportedly used to weed out candidates for the prestigious Harvard University. So, what are you waiting for?

Most people fail this fiendish puzzle that's said to be presented to potential Harvard University students.

If you think you've got the maths skills of a modern day Einstein, can work well under intense pressure, and have razor-sharp vision - this brainteaser is definitely for you. But, only 10 per cent of those that attempt this seemingly-impossible question are actually victorious, meaning you'll need to be a real genius to be able to crack it.

Puzzles like this aren't just a handy way to pass the time on those long commutes or rainy evenings - they're also a great mental workout. Research has suggested they have a positive impact on your central nervous system and have been shown to improve your concentration levels and attention span.

"Seven men have seven wives," the puzzle reads. "Each man and each wife have seven children. What is the total number of people?"

It may sound pretty straight-forward, but do not be fooled. You can't use a calculator and you'll need to carefully read the puzzle to total up the right answer. We're not giving you any clues - and we'll make things harder by challenging you to complete the task in just 45 seconds. Ready? Set. Go!

Giving up already, or think you've finally solved it? Scroll down to the bottom of the article to find the working out and answer.

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If you think you've passed the 'Harvard' test with flying colours, it's time to step things up. This so-called 'family-friendly' puzzle will actually test whether you have what it takes to become one of the nation's top spies.

Created by the Government Communications Headquarters (GCHQ), this puzzle requires a high-level of analytic skills and quick-thinking. Think you have what it takes to rid the world of evil- let's see how quickly you can work out which of the following word or phrases is the odd one out. Of course, there are absolutely no clues on this one - just use your intuition.

• Catwoman
• Deus Ex Machina
• Parishioner
• Pyromania
• Scuba

Feeling a tad stumped? You can find the answer here when you're ready to give up on your dream of becoming the next 007.

ANSWER: 112. Still confused? Here is how we worked it out:

• There are seven men
• Each man has one wife, so that means there are seven wives
• Each mine and each wife have seven children. So, 14 people each have seven kids, which equals 98.
• 7 +7 + 98 = 112.

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