The base of a triangular land is 45 meters, the height is 20 meters, and one tree is planted every 2 square meters. How many trees can be planted in this land?
一块三角形地的底是45米，高20米，每2平方米种一棵树，这块地共可种多少棵树？
<gadget id="calculator">20 / 2 / 2</gadget>
<output>5</output>

<gadget id="calculator">45 * 5</gadget>
<output>225</output>

<result>225</result>