A triangular wheat field has a base of 40 meters and a height of 15 meters. A total of 225 kilograms of wheat is harvested. How many kilograms of wheat are harvested on average per square meter?
一块三角形麦地，底是40米，高是15米，共收小麦225千克，平均每平方米收小麦多少千克？
<gadget id="calculator">15 / 2</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">40 * (15/2)</gadget>
<output>300</output>

<gadget id="calculator">225 / 300</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>