There are 420 boys in elementary school, and there are more boys than girls (1/5). How many girls are there?
小学有男生420人，男生比女生多(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>6/5 = around 1.2</output>

<gadget id="calculator">420 / (6/5)</gadget>
<output>350</output>

<result>350</result>