In six years Jill will be twice as old as Amanda. One year ago Jill was nine times older than Amanda. How old is Jill now?

Question

I tried 6 + 2x = x because in six years Jill will be twice Amanda's age, but this doesn't work.

I need a formula to work out but don't know where to start. I don't want the answer, I want to know how to find the formula to figure it out so I can do other problems.

Answer 1

You will need to have two equations with two unknowns. The first equation will be for the "In six years Jill will be twice as old as Amanda." and the second equation will be for the "One year ago Jill was nine times older than Amanda."

So if you use J for Jill and A for Amanda, both equations will have J and A in them.

Answer 2

If J is Jill's age now, then
J+6 is her age in 6 years.
But Amanda will also be 6 years older: A+6

Answer 3

Jill is 10 , Amanda is 1

Answer 4

10