The number of A is 3, the number of B is 5, the number of A is ((())/(())) of the number of B, and the number of A is less than the number of B.
甲数是3，乙数是5，甲数是乙数的((())/(()))，甲数比乙数少多少．
<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>