triangular piece of land with a base length of 280 meters and a height of 50 meters has a total of 3542 kilograms of rapeseed. How many kilograms of rapeseed are produced per hectare on average?
一块三角形地，底边长280米，高50米，共收油菜子3542千克，平均每顷产油菜子多少千克？
<gadget id="calculator">50 / 2 / 10_000</gadget>
<output>1/400 = around 0.0025</output>

<gadget id="calculator">280 * (1/400)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">3_542 / (7/10)</gadget>
<output>5_060</output>

<result>5_060</result>