There are 30 boys in Class 51, accounting for 60% of the whole class. How many people are there in the class?
五一班男生有30人，占全班人数的60%，全班有多少人？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">30 / (3/5)</gadget>
<output>50</output>

<result>50</result>