The ratio of male teachers to female teachers in a school is 2:5, how much more female teachers than male teachers?
某校男教师与女教师人数的比是2：5，女教师比男教师多多少．
<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>