The ratio of A to B is 3:4, and the ratio of B to C is 3:5. The number A is the number C ((())/(())).
甲数与乙数的比是3：4，乙数与丙数的比是3：5．甲数是丙数的((())/(()))．
<gadget id="calculator">9 / 20</gadget>
<output>9/20 = around 0.45</output>

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