B's number is 8, A's number is 5, A's number is less than B's number.
乙数是8，甲数是5，甲数比乙数少多少．
<gadget id="calculator">8 - 5</gadget>
<output>3</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>