A triangular rapeseed field has a base of 15 meters and a height of 40 meters. If 4.5 kilograms of rapeseed is harvested per square meter, how many kilograms of rapeseed can be harvested in this vegetable field?
一块三角形的油菜地，底边是15米，高40米．如果每平方米收油菜4.5千克，那么这块菜地可收油菜多少千克？
<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">15 * 20 * 4.5</gadget>
<output>1_350</output>

<result>1_350</result>