There are 120 boys in the sixth grade, which is (2/5) the number of sixth graders. How many girls are there in the sixth grade?
六年级有男生120人，是六年级人数的(2/5)，六年级有女生多少人．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">120 / (2/5)</gadget>
<output>300</output>

<gadget id="calculator">300 - 120</gadget>
<output>180</output>

<result>180</result>