The ratio of the number of males to females in a chorus team of a school is 5:7, how much more females than males.
某校合唱队男、女人数的比是5：7，女生比男生多多少．
<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>