In 10 years, A will be twice as old as B was 10 years ago. If A is now 9 years older than B the present age of B is	Choose the correct choice from the following options:
A) 37 B) 38 C) 39 D) 40 E) 41
let present age of A be a and B be b   a+10 = 2*(b-10)   =&gt; 2b-a = 30 ......(i)   a = b+9   =&gt;2b-b-9 = 30   b=39   so the present age of b is 39 years   ANSWER:39
<result>C</result>
In 10 years, A will be twice as old as B was 10 years ago. If A is now 9 years older than B the present age of B is