A rectangular field has a perimeter of 60 meters. The length is twice the width, if 8 kilograms of rice can be produced per square meter, how many kilograms of rice can this piece of cultivated land produce?
一块长方形的耕地，周长是60米．长是宽的2倍，如果每平方米能产稻谷8千克，这块耕地能产稻谷多少千克？
<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">60 / 2 / 3</gadget>
<output>10</output>

<gadget id="calculator">10 * 2 * 10 * 1 * 8</gadget>
<output>1_600</output>

<result>1_600</result>