Question

Sally is 39 years old and her mother is 69 , how years ago was Sally mother three times her age​

Answer 1

Answer:

Let assume x years ago sally will be 1/3 of her mother age

Sally age was at that point is 54-x

Sally mother age is 80-x

then 80-x=3(54-x)

it means 3x-x=162–80

means 2x = 82

x= 41

Hence 41 years ago sally age is 13 years and her mother age is 39 years.

thank you