Question 1189395
<br>
Tutor octo-pie didn't answer the question that was asked....<br>
The other tutor has the right answer, but it takes a long time for the reader to get through his treatment of the problem.<br>
x = original number of books
(1/5)x = original number of hardcover books
(4/5)x = original number of other books
(3/4)*(1/5)x = (3/20)x = number of hardcover books sold
(1/4)*(1/5)x = (1/20)x = number of hardcover books unsold
(2/3)x = number of books sold
(1/3)x = number of books unsold<br>
The fraction of unsold books that are hardcover is (number of unsold hardcover) divided by (total number unsold)<br>
{{{((1/20)x)/((1/3)x) = (1/20)/(1/3) = 3/20}}}<br>
ANSWER: 3/20 of the unsold books were hardcover<br>