The number of A is (2/5) of the number of B, the number of B is (3/4) of the number of C, and the number of A is C.
甲数是乙数的(2/5)，乙数是丙数的(3/4)，甲是丙的多少．
<gadget id="calculator">6 / 20</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>