Answer :
ok if JIM will be 20 in 2 years right now he is 18,and if TOM is twice as old as MARY but TOM is 2 years younger then JIM,JIM is 16,and so if TOM is 16 MARY is 8 years old
THE ANSWER IS 8 YEARS OLD-MARY IS 8
THE ANSWER IS 8 YEARS OLD-MARY IS 8