There are 30 boys in the dance group, and there are fewer girls than boys (1/5). How many girls are there?
舞蹈小组有男生30人，女生比男生少(1/5)，女生有多少人？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">30 * (4/5)</gadget>
<output>24</output>

<result>24</result>