Consider the question. 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?
Options:
(A) 30 days
(B) 35 days
(C) 25 days
(D) 27 days
(E) 29 days
If the answer is '(A)'; explain the reasoning:
1/50 + 1/75 = 5/150
30/1 = 30 days