Jonathan was born 6 years before william. In 2000, Jonathan's age was 2 years more than four times the age of william in 1995. How old will william be in 2020?
William's age --- x
Jon's age ------ x+6
in 2002:
x+6 = 4(x-5) + 2
x+6 = 4x - 20 + 2
-3x = -24
x = 8
so william is 8 in 2002
and Jon is 14 in 2002
you do the rest