(1/4) of the number A is equal to (1/5) of the number B, and the number A is equal to the number B.
甲数的(1/4)与乙数的(1/5)相等，甲数相当于乙数的多少．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">(1/5) / (1/4)</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>