Thirty men can do a work in 24 days. In how many days can 20 men can do the work, given that the time spent per day is increased by one-third of the previous time? Choose the correct choice from the following choices.
A) 27 days  B) 77 days  C) 88 days  D) 66 days  E) 22 days
Let the number of hours working per day initially be x. we have M1 D1 H1   = M2 D2 H2   30 * 24 * x = 20 * d2 * (4x)/3   =&gt; d2 = (30 * 24 * 3)/(24 * 4)   = 27 days.   27 daysnswer:27 days
<result>A</result>
Thirty men can do a work in 24 days. In how many days can 20 men can do the work, given that the time spent per day is increased by one-third of the previous time?