Once, this was a viral math problem...

 

Today, we're gonna solve a math problem that was once viral...

QUESTION:

Give a try to this problem

ANSWER:

Remember the PEMDAS / BODMAS rule:

* An easy way to remember: Please Excuse My Dear Aunt Sally *

 Now let's solve the question:

In the end, we have a correct answer: 9

But there was a historical rule (1917)  :

So, If we solve the problem according to the above rule, we'll get this:

* NOTE: WE DON'T USE THIS PROPERTY NOW. SO, THE CORRECT ANSWER IS 9 *

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Have a mathematical day!