The number of A is 20. 5 less than the number B, the number B is ((())/(())) of the number A, how much less the number A is than the number B.
甲数是20．比乙数少5，乙数是甲数的((())/(()))，甲数比乙数少多少．
<gadget id="calculator">20 + 5</gadget>
<output>25</output>

<gadget id="calculator">5 / 25</gadget>
<output>1/5 = around 0.2</output>

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