The number A is (1/5) of the number B, the number B is (1/5) of the number C, and the number A is the number C.
甲数是乙数的(1/5)，乙数是丙数的(1/5)，甲数是丙数的多少．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

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

<gadget id="calculator">(1/5) / 5</gadget>
<output>1/25 = around 0.04</output>

<result>1/25 = around 0.04</result>