John is three times as old as Sam. If John will be twice as old as Sam in six years, how old was Sam four years ago?	Select the correct option:
A) 2 B) 4 C) 6 D) 8 E) 16
j= 3s   after 6 years   j +6 = 2(s+6)   j= 2s+6   2s +6 = 3s   s= 6   four years ago   s= 6-4= 
<gadget id="calculator">6-4</gadget>
<output>2</output>
2   2 is the answer
<result>A</result>
John is three times as old as Sam. If John will be twice as old as Sam in six years, how old was Sam four years ago?