Minute Mystery: The Age Equation

Bite-sized brain teaser to solve in a minute or less.

 

 

The Age Equation

Category: Math, Algebra

Anna says:

“In five years, I will be twice as old as I was five years ago.”

How old is she right now?

 

 

Solution

  • Let Anna's current age be x.

  • Five years ago, she was x – 5.

  • In five years, she will be x + 5.

According to Anna's statement:

x + 5 = 2 × (x – 5)

Solve the equation to get her current age:

 

x + 5 = 2 × (x – 5)

 

x + 5 = 2x – 10

5 + 10 = 2x – x

x = 15 

Anna is 15 years old right now.

 

 

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