How old is Ann?

Algebra Level 3

Mary is 24 years old. She is twice as old as Ann was when Mary was as old as Ann is. How old is Ann?


The answer is 18.

A Former Brilliant Member by A Former Brilliant Member

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2 solutions

Barry Leung
Apr 6, 2019

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Let Ann be x years old now. When Mary was x years old, Ann was 2x-24 years old. Therefore 24=2(2x-24)=4x-48 or 4x=72 or x=18. Hence Ann is 18 years old now.

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