Question 909537
Turn the words into equations
f=3t
f-4=4*(t-4)
You will need an equation for each unknown
We have two unknowns (father and Tom )and we have two equations.

Now substitute 3t in for f in the 2nd equation

3t-4=4*(t-4)
and solve for t
 This is nice because we want to know t (Tom's age)