Six years ago, Jim was four times as old as Fe. In four years, he would be twice as old as Fe. How old are they now?

1 answer

J - 6 = 4(F-6) = 4F -24

Therefore J = 4F - 18

J + 4 = 2F

Substitute 4F-18 for J in the third equation and solve for F. Insert that value into the second equation to solve for J. Check by putting both values into the third equation.