Mr. Li has to correct 84 compositions, and 80 of them have already been corrected. How many times is the number of essays that have been corrected compared to the number of uncorrected essays?
李老师要批改84篇作文，已经批改了80篇．已经批改的作文篇数是未批改的作文篇数的几倍？
<gadget id="calculator">84 - 80</gadget>
<output>4</output>

<gadget id="calculator">80 / 4</gadget>
<output>20</output>

<result>20</result>