There are 20 people in the mathematics interest group in the school, and the number of the English interest group is 80% of that of the mathematics interest group. How many people are there in the English interest group?
学校数学兴趣小组有20人，英语兴趣小组的人数是数学兴趣小组的80%，英语兴趣小组有多少人．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">20 * (4/5)</gadget>
<output>16</output>

<result>16</result>