A classic math puzzle for kids has reappeared on social media after netizens were tasked with finding the correct answer.

In the picture below, you will see a series of equations that you are asked to use in order to solve the puzzle by finding out which number should replace the question mark in the fourth line.

Before you get started, we want to give you a few heads up to make sure you stay on the right path.

Start solving the line by line. We suggest you replace the icons with letters for your convenience. Keep in mind that one of the operation symbols in the final equation is multiplication. If you remember your math lessons, you probably know that multiplication has a higher priority than addition and should be addressed first.

Now, let’s get to work!

What’s your final answer? Here’s one final chance to correct it before we reveal the solution.

The answer to this puzzle is 30!

And here’s how to solve it…

First of all, let’s presume that S stands for icons with shoes, C for cat, and W for icons with whistles.

LINE 1: S + S + S = 30. Therefore, 3S = 30 and S = 10.

LINE 2: S + C + C = 20. Therefore, 10 + 2C = 20 and 2C = 10. This means that C = 5.

LINE 3: C + W + W = 13. Therefore, 5 + 2W = 13 and 2W = 8. This means that W = 4.

LINE 4: S + C x W = 10 + 5 x 4 = 10 + 20 = 30. This answer is 30. Make sure you perform multiplication before addition.

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