The office bought a pack of paper, and planned to use 20 sheets per day, which can be used for 28 days. Due to the attention to saving, only 16 sheets are actually used per day. How many days have you actually used?
办公室买来一包纸，计划每天用20张，可以用28天．由于注意节约，实际每天只用16张，实际用了多少天？
<gadget id="calculator">28 / 16</gadget>
<output>7/4 = around 1.75</output>

<gadget id="calculator">20 * (7/4)</gadget>
<output>35</output>

<result>35</result>