A's number is 5, B's number is 2, and B's number is less than A's number.
甲数是5，乙数是2，乙数比甲数少多少．
<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>