The number of A is (3/4) of the number of B, and the number of B is (1/5) of the number of C. If the number of C is 40, what is the number of A?
甲数是乙数的(3/4)，乙数是丙数的(1/5)，如果丙数是40，则甲数是多少．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">40 * (1/5) * (3/4)</gadget>
<output>6</output>

<result>6</result>