The ratio of boys to girls in Shengli Primary School is 7:5, how much more boys than girls.
胜利小学男生与女生人数的比是7：5，男生比女生多多少．
<gadget id="calculator">7 - 5</gadget>
<output>2</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>