There are 72 people in the school dance group and art group. Among them, the number of people in the art group is the dance group (4/5), how many people are there in the dance group?
学校舞蹈组与美术组共72人．其中美术组的人数是舞蹈组的(4/5)，舞蹈组有多少人？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 + (4/5)</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">72 / (9/5)</gadget>
<output>40</output>

<result>40</result>