A is (3/4) of B, B is (1/5) of C, if C is 40, how much is A.
A是B的(3/4)，B是C的(1/5)，如果C是40，则A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>