The difference between the ages of A and B is 10 years. Ten years ago, A was twice as old as B. Find the age of A, 10 years hence.  Choose the most appropriate option.
A) 20 years	B) 30 years	C) 40 years	D) 50 years	E) 60 years
given that A-B=10 -&gt;(1)   A-10=2(B-10)   A=2B-10 -&gt;(2)   by solving 1&amp;2   we get A=30,B=20   After 10 years age of A is 40 years   ANSWER:40 years
<result>C</result>
The difference between the ages of A and B is 10 years. Ten years ago, A was twice as old as B. Find the age of A, 10 years hence.