A triangular vegetable plot harvests a total of 450 kilograms of vegetables. Its base is 12 meters and its height is 5 meters. How many kilograms of vegetables are harvested on average per square meter?
一块三角形菜地共收蔬菜450千克，它的底是12米，高是5米，平均每平方米收蔬菜多少千克？
<gadget id="calculator">12 * 5</gadget>
<output>60</output>

<gadget id="calculator">60 / 2</gadget>
<output>30</output>

<gadget id="calculator">450 / 30</gadget>
<output>15</output>

<result>15</result>