Question 1170227
.
<pre>

1 foot = 12 inches.


3 feet = 36 inches


3 1/2 feet = 42 inches.


The number of books = {{{42/((5/8))}}} = {{{(42*8)/5}}} = {{{336/5}}} = 67.2.


As a last step, we round the value of 67.2 to the closest LESSER integer number and get the


<U>ANSWER</U>.  67 books.
</pre>

Solved.