This is Number Series Question which will train your brain for better thinking. In this number series puzzle, you are shown some numbers. These given numbers follow a certain sequence.

Can you decode this logical or mathematical sequence followed by these numbers and find the next number in this series which will replace the question mark?

### The answer is 45.

Difference between two consecutive numbers increases by 2 from the previous difference.

So complete series is 3 5 9 15 23 33 45 59

### See more: Only 1 in 5 get this simple riddle right: Figure out the fastest way to empty the bathtub!

Riddles are proven to help improve your brain function, logical thinking and focus! We love finding tricky riddles for you to try out so this is a new series of brainteasers for you! What are you waiting for, give it a go!

The riddle below has made thousands of Internet users scratch their heads in bewilderment. Can you solve it?

You have a spoon, a cup, and a bucket – now what’s the fastest way to get the water out? You can only use one method!

Think about this one for a while. I don’t know how they found this out, but apparently, only 1 in 5 adults get it right on the first try. So this is far from simple!

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**Find the answer below!**

**The answer is: Pull the plug!**

Sure, it wasn’t listed as an alternative – but who said that you had to use the bucket, the cup or the spoon? The fastest way to empty the tub is without a doubt to pull the plug!