a does half as much work as b in 3 - fourth of the time . if together they take 18 days to complete the work , how much time shall b take to do it ?
Select:  A) 30 days  B) 35 days  C) 40 days  D) 45 days  E) 50 days

Rationale: explanation : let ‘ x ’ be the number of days taken by b alone to finish the whole work then , a alone will finish the whole work in 3 x / 4 × 2 days = 3 x / 2 days . then , working together , 3 x / 2 × x / 3 x / 2 + x = 18 days 3 x × x / 5 x = 18 3 x / 5 = 18 therefore , the number of days taken by b = x = 18 × 5 / 3 = 30 days . answer : option a
Answer: A