A is twice as good as B. And together they finish a piece of work in 18days. In how many days will A alone finish the work	Options:	A) 25	B) 27	C) 15	D) 18	E) 21

Rationale: ( a ' s 1 day work ) : ( b ' s 1 day work ) = 2 : 1 a + b 1 day work = 1 / 18 a ' s 1 day work = ( 1 / 18 ) * ( 2 / 3 ) = 1 / 27 a alone can finish the work in 27 days answer is b
Answer: B