The number of A is 50, the number of B is 40, how much more is the number of A than the number of B.
甲数是50，乙数是40，甲数比乙数多多少．
<gadget id="calculator">50 - 40</gadget>
<output>10</output>

<gadget id="calculator">10 / 40</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>