A belongs to B (1/5), B belongs to C (1/5), how much does A belong to C
甲是乙的(1/5)，乙是丙的(1/5)，甲是丙的多少
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

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