A rectangular field has a perimeter of 80 meters. The ratio of length to width is 3:2. If 1.5 kilograms of rice can be produced per square meter, how many kilograms of rice can this piece of arable land produce?
一块长方形的耕地，周长是80米．长和宽的比是3：2，如果每平方米能产稻谷1.5千克，这块耕地能产稻谷多少千克？
<gadget id="calculator">80 / 2</gadget>
<output>40</output>

<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">40 * (3/5)</gadget>
<output>24</output>

<gadget id="calculator">40 - 24</gadget>
<output>16</output>

<gadget id="calculator">24 * 16 * 1.5</gadget>
<output>576</output>

<result>576</result>