A piece of trapezoidal ground is 220 meters long at the upper base, 340 meters long at the lower base, and 57.5 meters high, with a total of 3542 kg of oilseeds. How many kilograms of oilseeds are produced per hectare?
一块梯形地上底长220米，下底长340米，高是57.5米，共收油籽3542千克．平均每公顷产油籽多少千克？
<gadget id="calculator">220 + 340</gadget>
<output>560</output>

<gadget id="calculator">57.5 / 2 / 10_000</gadget>
<output>0.002875</output>

<gadget id="calculator">560 * 0.002875</gadget>
<output>1.61</output>

<gadget id="calculator">3_542 / 1.61</gadget>
<output>2_200</output>

<result>2_200</result>