The ratio of boys to girls in the school chorus is 3:4, how much less boys than girls.
学校合唱队男生人数与女生的比是3：4，男生人数比女生少多少．
<gadget id="calculator">4 - 3</gadget>
<output>1</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>