15 years later, A will be twice as old as B but five years ago A was 4 times as old as B. Find the difference of their present ages ?

15 years later, A will be twice as old as B but five years ago A wa

1.	15 years later, A will be twice as old as B but five years ago A was 4 times as old as B. Find the difference of their present ages ?
A.	10 years
B.	20 years
C.	30 years
D.	40 years
Answer» D. 40 years