The number of science and technology groups in Hongxing Primary School is 60% of that of the chorus group, and there are 300 people in the science and technology group. How many people are there in the choir?
红星小学科技小组人数是合唱小组的60%，科技小组有300人．合唱小组有多少人？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">300 / (3/5)</gadget>
<output>500</output>

<result>500</result>