At first glance, the puzzle below consists of four rows of the letter S. However, things aren’t as simple as they seem! There’s an odd one out hiding in the throng of similar letters; can you find it?

Once you’ve given it your best shot, check out the solution at the bottom of the page.

A

n

S

W

E

R

=================

See more: Most adults fail this simple math test – but can you break it?

Classic brain training methods are perhaps puzzles like crosswords or sudoku, but in recent times I have become more and more attracted to the type of challenge you’ll see below.

These types of puzzles have been flooding the web lately, probably because they are really fun!

These are old classic mathematical problems. When you were in middle or high school.

These tests are more fun when you find yourself trying to remember the math you learned as a child.

Can you figure out the correct solution?

**Knowledge degrades**

So now I’m going to treat you to a math problem designed for school students. But it’s not that simple for those of us who graduated decades ago. It’s easy to forget the order of operations as we grow older.

Now to the brainteaser – can you figure out the answer? Try to think back on the mathematical rules!

A

B

C

D

E

To help you along, we’ve provided 3 solutions.

We can already reveal that “C: Something else” can be discarded.

So either 24 or 154 is correct. But which one?

2 × 5 + 3 + 1 × 11

If you remember, multiplication is always done before addition. Therefore:

10 + 3 + 11

There we go!

The solution is 24.

Did you get it right?