The office bought a batch of copy paper, and planned to use 60 sheets per day, which can be used for 20 days. In order to save paper, it was actually used for 25 days. How many sheets of paper were used less than planned each day?
办公室买进一批复印纸，计划每天用60张，可以用20天．为了节约纸张，实际用了25天，实际每天比计划少用多少张纸？
<gadget id="calculator">20 / 25</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">60 * (4/5)</gadget>
<output>48</output>

<gadget id="calculator">60 - 48</gadget>
<output>12</output>

<result>12</result>