Dr. Escalera is now three times as old as his son. Twelve years from now, Dr. escalera will be twice as old as his son. How old are they now?
f = 3 s
f+12 = 2(s+12)
3 s + 12 = 2 s + 24
s = 12
f = 36
f+12 = 2(s+12)
3 s + 12 = 2 s + 24
s = 12
f = 36