A millionaire bought a job lot of hats 1/4 of which were brown. The millionaire sold 2/3 of the hats including 4/5 of the brown hats. What fraction of the unsold hats were brown.  Choose the correct answer:
A) 1/60  B) 1/15  C) 3/20  D) 3/5  E) 3/4
If initially he had x hats.   x/4 were brown.   sold x*2/3 hats. left with x/3 hats.   sold (x/4)*((4/5) = x/5 brown hats and left with x/4-x/5= x/20 brown hats.   Fraction of brown hats in total remaining hats = (x/20)/(x/3) = 3/20 hats   ANSWER:3/20
<result>C</result>
A millionaire bought a job lot of hats 1/4 of which were brown. The millionaire sold 2/3 of the hats including 4/5 of the brown hats. What fraction of the unsold hats were brown.