There are 60 boys in the sixth grade, less than the number of girls (1/4), and how many fewer boys than girls.
六年级男生有60人，比女生人数少(1/4)，男生比女生少多少人．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">60 / (3/4)</gadget>
<output>80</output>

<gadget id="calculator">80 - 60</gadget>
<output>20</output>

<result>20</result>