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.
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