The ratio of length, width and height of a cuboid is 3:2:5, its width is known to be 4 decimeters, what is its volume in cubic decimeters.
一个长方体的长、宽、高的比是3：2：5，已知它的宽是4分米，它的体积是多少立方分米．
<gadget id="calculator">3 + 2 + 5</gadget>
<output>10</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">4 / (1/5)</gadget>
<output>20</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">20 * (3/10) * 4 * 20 * (1/2)</gadget>
<output>240</output>

<result>240</result>