In a mathematics test, 30 students in the five-year class got excellent, and the excellent rate reached 75%. How many students are there in the five-year class?
一次数学测验，五年一班有30人取得优秀，优秀率达到75%，五年一班共有多少名学生？
<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">30 / (3/4)</gadget>
<output>40</output>

<result>40</result>