(4/5) of the number A is the number B, (2/3) of the number B is the number C, and the number C is 30, what is the number A? (don't use equations to solve)
甲数的(4/5)是乙数，乙数的(2/3)是丙数，丙数是30，甲数是多少？(不要用方程解答)
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">30 / (2/3) / (4/5)</gadget>
<output>225/4 = around 56.25</output>

<result>225/4 = around 56.25</result>