Understand the numbers above? Neither did I. The puzzle has had people thinking all over Facebook, earning more than 3 million shares from people who have apparently figured it out.

If you do think you understand the logic, then try and answer this equation before scrolling down any further:

If 6 + 4= 210, then ?+? = 123

Think you’ve got it? YouTube user Presh Talwalker explains why you’re probably wrong…

Understand any of that? If not, having it written down might help:

Let’s take 10 + 6 = 416. How do you get 416 from those numbers?

10 – 6 = 4

10 + 4 = 16

Write those answers next to each other and you get 416

So ?+? = 123

Split the number in two: the answers you need to get are 1 and 23

See which numbers will add together to make 23. You need to also be able to subtract one from another to give you 1.

12 – 11 = 1

12 + 11 = 23

Write those answers next to each other and you get 123. So 12+11 = 123. Math is hard. Did you get it? Be honest.