Sally is 54 years old, and her mother is 80. How many years ago was Sally’s mother three times her age?

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Guest Aug 25, 2019

Guest · Answer 1 · 2019-08-25T12:34:02

So you can give x=1/3. And so sally 54-x is what Sally’s age was.

41 years ago Sally was 13 and her mother was 39.

Melody · Answer 2 · 2019-08-25T12:50:33

I will make it X years ago

\(80-X=3(54-X)\\ 80-X=162-3X\\ 80-X+3X=162-3X+3X\\ 80+2X=162\\ 2X=82\\ X=41 \)

So it was 41 years ago, just like guest said :)