In a trapezoidal wheat field, the upper base is 30 meters, the height is 50 meters, and the lower base is 60 meters. A total of 63 kilograms of chemical fertilizers are applied, how many kilograms of chemical fertilizers are applied per square meter?
一块梯形麦田，上底30米，高50米，下底60米，共施化肥63千克平均每平方米施化肥多少千克？
<gadget id="calculator">30 + 60</gadget>
<output>90</output>

<gadget id="calculator">50 / 2</gadget>
<output>25</output>

<gadget id="calculator">90 * 25</gadget>
<output>2_250</output>

<gadget id="calculator">63 / 2_250</gadget>
<output>7/250 = around 0.028</output>

<result>7/250 = around 0.028</result>