To bind a batch of books, if 60 books are bound every day, it will take 5 days to complete. If it takes 4 days to complete, how many copies should be stapled per day?
要装订一批图书，如果每天装钉60本，要5天完成．如果要4天完成，每天应装钉多少本？
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">60 * (5/4)</gadget>
<output>75</output>

<result>75</result>