Plant potatoes in a rectangular field with an area of 450 square meters, plant one plant in an average of 0.15 square meters, and harvest an average of 2.9 kilograms of potatoes per plant. How many kilograms of potatoes can be harvested in this land?
在一块面积是450平方米的长方形地里栽土豆，平均0.15平方米栽一株，平均每株收土豆2.9千克，这块土地共收土豆多少千克？
<gadget id="calculator">450 / 0.15</gadget>
<output>3_000</output>

<gadget id="calculator">3_000 * 2.9</gadget>
<output>8_700</output>

<result>8_700</result>