B is A's (1/3), C is B's (1/3), and C is A's amount.
乙是甲的(1/3)，丙是乙的(1/3)，丙是甲的多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/3) * (1/3)</gadget>
<output>1/9 = around 0.111111</output>

<result>1/9 = around 0.111111</result>