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.

This 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 find the correct number?

Okay, here comes the challenge.

In the picture below, you will face a math problem, and there are three different possible solutions you can pick from.

Which of the answers do you think is right?

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You have to first, as I said, figure out the order of operations.

Should you just solve everything from left to right?

Well, no. Not really.

You must solve the multiplication before the addition.

Now, on the other hand, after solving that part – you can actually solve the rest from left to right.

In conclusion, it becomes very simple – and now I think you know the answer!

Below you can see the solution!

Did you manage to solve this math problem?