Question 999503
let x = the number of years ago.


you get 84 - x = 2 * (46 - x)


that results in 84 - x = 92 - 2x


add 2x to both sides of this equation and subtract 84 from both sides of this equation to get:


x = 8


he's 84 now.
8 years ago he was 76


she's 46 now.
8 years ago she was 38


2 * 38 = 76


looks like we did good.


answer is the age of grandpa was 2 times the age of mom 8 years ago.