There are 12 people in class five (one) with excellent long jump results, and the excellent rate is 40%. How many people are there in class five (one)? How many.
五(一)班跳远成绩优秀的有12人，优秀率为40%，五(一)班共有多少人？多少．
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">12 / (2/5)</gadget>
<output>30</output>

<result>30</result>