I use a chart for most age problems.Jack is six years older than Jane.
Six years ago he was twice as old as she was.
How old is Jane now?
Make a row for each person.
Make a column for "Now".
Let = Jane's age now.
Then = Jack's age now.
. . Write those in the "Now" column.
Make a column for the other time period: "6 years ago".
Six year ago, both were six years younger.
. . Jack was only years old.
. . Jane was only years old.
Write those in the second column.
It says, "Six years ago, Jack was twice Jane's age ."
. . and there is our equation: .