You might have scored an A1 (okay, a B3) in Honours Maths and still pride yourself on knowing Pythagoras's Theorum, but can you solve this kids' brainteaser?

Twitter has lost it today over a maths puzzle that seems simple at first – until you find out what the right answer ACTUALLY is.

Let's take a look:

If you're anything like us, you'll have confidently concluded that the right answer is 16.

Easy right? Well, not so fast, as the correct answer is in fact 15.

Let's break it down.

Three apples equals 30, so one apple is equal to 10.

An apple and two bunches of bananas is 18, meaning each bunch of bananas is equal to 4.

And a bunch of bananas minus a cocount equals two, meaning each coconut is equal to 2.

Adding up a coconut plus an apple plus a banana, therefore, should leave you with 16 (10 + 4 + 2), until you look a little closer the coconut in the final line:

Yup, it's only half a coconut, meaning the real answer is 15.

Kicking yourself? So are we.