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 :

In 10 years, A will be twice as old as B was 10 years ago. If A is

1.	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 :
A.	19
B.	29
C.	39
D.	49
Answer» D. 49