There are 12 boys in the painting group of the school, accounting for 2/5 of the total number of the painting group. How many people are there in the painting group?
学校绘画小组有男生12人，占绘画小组总人数的(2/5)，绘画小组一共有多少人？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">12 / (2/5)</gadget>
<output>30</output>

<result>30</result>