In 10 years, A will be twice as old as B was 10 years ago. If A is now 4 years older than B the present age of B is	Choose the most appropriate option
A) 37  B) 38  C) 39  D) 34  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+4   =&gt;2b-b-4 = 30   b=34   so the present age of b is 34 years   ANSWER:34
<result>D</result>
In 10 years, A will be twice as old as B was 10 years ago. If A is now 4 years older than B the present age of B is