The ratio of males to females in a school chorus is 5:7, males account for the total number ((())/(())), how much more females than males.
某校合唱队男、女人数的比是5：7，男生占总人数的((())/(()))，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>