Only true geniuses can solve this puzzle in record time.
Maths isn't a subject many of us liked at school, but we all have to admit that maths puzzles are a great way to give our brains a workout. Keeping your mind healthy is just as important as the rest of your body, and brain teasers are one of the best forms of exercise for the vital organ - as they can help boost cognitive function and keep degenerative diseases like dementia at bay.
So if you're looking for a way to put your brain to the test today, why not try out this tricky maths puzzle? All you need to do is find the missing number.
Take a look at the image above. You'll see six circles arranged in a star pattern, with five of the circles containing a number and one circle containing a red question mark. It's your job to find out what number belongs in the final circle.
You'll also notice there's the number 90 in the middle of the star, while the circles that are already in read 50, 40, 10, 30, and 20. So what do you think the missing number could be? There's a simple way to work it out, but you'll need to be able to think outside the box to get it right.
According to JagranJosh, the brainiest people among us can find the number in as little as just 10 seconds - so why not set yourself a timer and see how quickly you can work it out? Don't worry if it takes you longer, getting to the right answer in any timeframe is still an achievement.
Have you worked it out yet? If you're still thinking, don't scroll any further as we're about to give you the answer.
Answer
The missing number was another 30. The star shape was made up of two triangles with a number at each point. The first triangle would lead you to 50, 10, and 30 - which added together makes 90. The second triangle incorporated the 20 and the 40 along with the missing number. 20 + 40 makes 60, so you'd need 30 to reach the desired total of 90.
If you're in the mood to try out more puzzles, why not give this one a go and try to find the hidden object in the serene woodland scene? Or this one, which challenges you to find the seahorse hiding in the aquarium.
There are also different types of puzzles you can try, such as this fiendishly difficult quiz shared by the question editor for BBC Two's Only Connect, or this maths equation that is said to be so tricky that only those with the IQ of Albert Einstein can solve it, or even this Who Wants To Be A Millionaire jackpot question that saw one contestant miss out on £1 million.
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