Wang Hong practiced writing brush characters. She planned to write 25 characters a day and finished them in 24 days. She actually wrote 30 characters a day. How many days did it actually take?
王红练习写毛笔字，计划每天写25个，24天写完，实际每天写了30个，实际用了多少天写完？
<gadget id="calculator">24 / 30</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">25 * (4/5)</gadget>
<output>20</output>

<result>20</result>