cement brick is 30 cm long, its width is long (2/3), and its height is long (2/5). What is the volume of this cement brick?
一块水泥砖长30厘米，宽是长的(2/3)，高是长的(2/5)，这块水泥砖的体积是多少？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">30 * (2/3)</gadget>
<output>20</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">30 * (2/5)</gadget>
<output>12</output>

<gadget id="calculator">30 * 20 * 12</gadget>
<output>7_200</output>

<result>7_200</result>