The ratio of Xiaoming's original number to Xiaohua's is 2:5, how much less is Xiaoming's original number than Xiaohua's
小明的本数与小华的比是2：5，小明的本数比小华少多少
<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>