triangular piece of land is 500 meters long and 78 meters high. A total of 13,650 kilograms of cotton is harvested. How many kilograms of cotton are produced per hectare on average?
一块三角形地，底边长500米，高78米，共收棉花13650千克，平均每公顷产棉花多少千克？
<gadget id="calculator">78 / 2 / 10_000</gadget>
<output>39/10_000 = around 0.0039</output>

<gadget id="calculator">500 * (39/10_000)</gadget>
<output>39/20 = around 1.95</output>

<gadget id="calculator">13_650 / (39/20)</gadget>
<output>7_000</output>

<result>7_000</result>