There are 30 boys in the school choir, accounting for 2/5 of the total number. How many people are there in the choir?
学校合唱团有男生30人，占总人数的(2/5)，合唱团共有多少人？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">30 / (2/5)</gadget>
<output>75</output>

<result>75</result>