A's number is 40, B's number is 50, and A's number is less than B's number.
甲数是40，乙数是50，甲数比乙数少多少．
<gadget id="calculator">50 - 40</gadget>
<output>10</output>

<gadget id="calculator">10 / 50</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>