If A takes x days to do a work then B takes 2x days to do the same work then with in how many day's A will alone complete this work ?  Options.
A) 27
B) 23
C) 24
D) 25
E) 26

Rationale: 1 / x + 1 / 2 x = 1 / 18 = > 3 / 2 x = 1 / 18 = > x = 27 days . hence , a alone can finish the work in 27 days . answer : a
Answer: A