The respective ages of father and his son are 40 and 16 years. In how many years will the father be twice as old as his son ?	Choose the correct choice from the following options:
A) 19 years  B) 8 years  C) 10 years  D) 15 years  E) 12 years
Suppose x years later the father will be twice as old as his son.   x + 40 = 2 (x + 16)   x = 40 - 32= 
<gadget id="calculator">40 - 32</gadget>
<output>8</output>
8 years   answer : 8 years
<result>B</result>
The respective ages of father and his son are 40 and 16 years. In how many years will the father be twice as old as his son ?