The number of people in the aircraft model group of the school is 4/5 of that of the computer group, the number of people in the computer group is 3/4 of that of the art group, the number of people in the aircraft model group is 12, how many people are there in the art group?
学校航模组人数是电脑组人数的(4/5)，电脑组人数是美术组的(3/4)，航模组有12人，美术组有多少人？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">12 / (4/5) / (3/4)</gadget>
<output>20</output>

<result>20</result>