The number A is 4, the number B is 5, the number B is ((())/(())) of the number A, how much less the number A is than the number B.
甲数是4，乙数是5，乙数是甲数的((())/(()))，甲数比乙数少多少．
<gadget id="calculator">5 - 4</gadget>
<output>1</output>

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

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