The outstanding students in class 51 in a math test are the whole class (1/5), which happens to be 10 people. How many people are there in class 51?
五1班同学在一次数学测试中的优秀生是全班同学的(1/5)，恰好是10人，五1班有多少人．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">10 / (1/5)</gadget>
<output>50</output>

<result>50</result>