There is a sheet of iron that is 3 meters long and 8 decimeters wide, what is its area?
有一块铁皮长3米，宽8分米，它的面积有多大？
<gadget id="calculator">3 * 10</gadget>
<output>30</output>

<gadget id="calculator">30 * 8</gadget>
<output>240</output>

<result>240</result>