The number of the school chorus team is more than that of the dance team (2/7), and the number of the dance team is 18 less than that of the chorus team. How many people are in the dance team?
学校合唱队的人数比舞蹈队多(2/7)，舞蹈队人数比合唱队少18人．舞蹈队有多少人？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">18 / (2/7)</gadget>
<output>63</output>

<result>63</result>