There are 15 people in class five (one) with excellent long jump results, and the excellent rate is 50%. How many people are there in class five (one)?
五(一)班跳远成绩优秀的有15人，优秀率为50%，五(一)班共有多少人？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">15 / (1/2)</gadget>
<output>30</output>

<result>30</result>