A man is 20 years older than his son. In two years, his age will be twice the age of his son. The present age of his son is  Choose the correct choice from the following:
A) 16
B) 14
C) 15
D) 18
E) 20
Explanation:   Let the son's present age be x years. Then, man's present age = (x + 20) years   =&gt; (x + 20) + 2 = 2(x + 2)   =&gt; x + 22 = 2x + 4   So, x = 18. Answer: 18
<result>D</result>
A man is 20 years older than his son. In two years, his age will be twice the age of his son. The present age of his son is