If 4 men or 6 boys can finish a work in 20 days. How long will 6 men and 11 boys take to finish the same work?  Choose one:
A) 10 days  B) 6 days  C) 4 days  D) 3 days  E) 8 days
4 men = 6 boys   Then, 1 boy = 4/6 men = 2/3 men   11 boys = 2/3 × 11 men = 22/3 men   Then, 6 men + 11 boys = 6 + 22/3 men = 40/3 men   1 work done = 4 men × 20days   That is, 4 × 20 = 40/3 × ? days   ? days = 4 × 20 × 3/40 = 6 days   Answer : 6 days
<result>B</result>
If 4 men or 6 boys can finish a work in 20 days. How long will 6 men and 11 boys take to finish the same work?