In 10 years, A will be twice as old5as B was 10 years ago. If A is now 11 years older than B, the present age of B is
Choices:	A) 35	B) 37	C) 39	D) 41	E) 42

Rationale: "explanation : let b ' s age = x years . then , as age = ( x + 11 ) years . ( x + 11 + 10 ) = 2 ( x — 10 ) hence x = 41 . present age of b = 41 years answer : option d"
Answer: D