Answer:
John: 8yrs old
Paul: 4yrs old
Step-by-step explanation:
if John is 8 and Paul is 4 then 2 yrs ago they would be 6 yrs old and 2yrs old respectively.
currently Paul is x
John is 2x
2yrs ago Paul is x-2
john is 2x-2
so
3(x-2)=2x-2
3x-6=2x-2
3x-2x=-2+6
x=4