is (2/3) of B, B is (1/5) of C, if C is 45, then how much is A.
A是B的(2/3)，B是C的(1/5)，如果C是45，那么A是多少．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">45 * (1/5) * (2/3)</gadget>
<output>6</output>

<result>6</result>