Ravi can do a piece of work in 50 days while Prakash can do it in 75 days. In how many days will they finish it together?
Choose the correct choice from the following options.
A) 30 days	B) 35 days	C) 25 days	D) 27 days	E) 29 days

Rationale: 1 / 50 + 1 / 75 = 5 / 150 30 / 1 = 30 days answer : a
Answer: A