9 Out Of 10 People Blanked On This — I'm A Number, Multiply Me By 2 And Add 12, You Get 30. What Number Am I?

A number is talking to you. Multiply it by 2 and add 12. You get 30. What is the number?

Most people stare at this and either guess randomly or just give up. The ones who get it right remember one thing from school — algebra.

Solution:

The answer is 9.

Here is how. Call the mystery number x. Multiply by 2 and you have 2x. Add 12 and you get 2x plus 12 equals 30. Subtract 12 from both sides and 2x equals 18. Divide by 2 and x equals 9.

Simple algebra. One minute of thinking. That is all it takes.

Did you get it right?