If:

2 + 2 = 4,
3 + 2 = 5,
3 + 4 = 14,
4 + 2 = 18 and
5 + 3 = 40

What is 6 + 3?

I’ll announce the answer in a week. Post a comment below if you think you have the answer ;)

UPDATE

So, after a week, JP was the only one to get the correct answer!

If:

2 + 2 = 4, (common multiple = 1)
3 + 2 = 5, (common multiple = 1)
3 + 4 = 14, (common multiple = 2)
4 + 2 = 18 and (common multiple = 3)
5 + 3 = 40 (common multiple = 5)

What is 6 + 3?

As you can see, the common multiple for each line of equation evaluates to a Fibonacci sequence (starting at 1), and the last common multiple was 5, so the next one will be 8, therefore:

6 + 3 = 9 * 8 = 72