SOLUTION: Today Tom is twice as old as Mary. If Tom was 11 three years ago, how old will Marry be when Tom is 20?

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Question 322264: Today Tom is twice as old as Mary. If Tom was 11 three years ago, how old will Marry be when Tom is 20?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
let Mary's age be x
Tom's age will be 2x
..
Three years ago tom was 11 years
Three years ago Tom was 2x-3
So 2x-3=11
2x=14
2x=14/2
x=7
Mary is 7 years today.
..
Tom was 11 years, 3 years ago
So tom is 14 years now
After 6 years Tom will be 20 years.
Mary is 7 years now so after 6 years she will be 13 years.