A man is 28 years older than his son. In four years, his age will be twice the age of his son. The present age of this son is  Choose the correct choice:
A) 21 years	B) 22 years	C) 23 years	D) 24 years	E) 25 years
Explanation:   Let's Son age is x, then Father age is x+28.   =&gt; 2(x+4) = (x+28+4)   =&gt; 2x+8 = x+32   =&gt; x = 24 years   Answer: Option 24 years
<result>D</result>
A man is 28 years older than his son. In four years, his age will be twice the age of his son. The present age of this son is