Kobayashi's family has a triangular rapeseed field with a base of 45 meters and a height of 12 meters. If an average of 0.45 kilograms of rapeseed is harvested per square meter, how many kilograms of rapeseed can be harvested in this land?
小林家有一块底是45米，高是12米的三角形油菜地．如果平均每平方米收油菜籽0.45千克，这块地一共可以收油菜籽多少千克？
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">45 * 6 * 0.45</gadget>
<output>121.5</output>

<result>121.5</result>