The number B is (3/4) of the number A, the number C is (3/5) of the number B, and the number C is the number of A.
乙数是甲数的(3/4)，丙数是乙数的(3/5)，丙数是甲数的多少．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/4) * (3/5)</gadget>
<output>9/20 = around 0.45</output>

<result>9/20 = around 0.45</result>