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PUT your maths skills to the test by trying to solve this puzzle.

If you're able to work out the answer in under 15 seconds, it could mean you have a top IQ.

Can you solve this in under 15 seconds?
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Can you solve this in under 15 seconds?Credit: Freshers Live

Brain teaser fans have been challenged to work out the answer to the fourth sum by using the first three.

To solve the final problem, you need to work out what number each fruit represents.

The first shows three mangoes added together to make 15, which divided by three equals five.

And the second sum shows one mango added to two pears totalling 23.

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Minusing the mango, five, from 23 gives 18 - which is divided by two to represent each pear equals nine.

The third equation then shows a pineapple plus two pears equaling 21.

So, we know one pear is nine, so double that is 18 - and 21 minus 18 is 3, so pineapples must represent three.

And so the final problem should be easy to solve now - its one mango (five) plus and pineapple (three) plus a pear (nine), which totals 17.

If you were able to solve that one easily, have a go at this maths problem which has stumped the internet.

Or try spotting the correctly spelled word in this puzzle in just five seconds.

In this perplexing optical illusion, a dog sits almost concealed from view - with puzzle lovers left baffled trying to spot it.

Can you also find the correctly-spelled word in this puzzle?

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