6 women can do 75 units of work in 8 days by working 5hrs/day. In how many days can 4 women do 30 units of work by working 8hrs/day ?  Choose the correct choice from the following choices.
A) 3 days B) 4 days C) 5 days D) 6 days E) 7 days

Rationale: 6 x 8 x 5 / 75 = 4 x 8 xa / 30 solve this for a then we get a = 3 days answer : a
Answer: A