A rectangular navel orange orchard is 45 meters long and 20 meters wide. If each navel orange tree covers an area of 3 square meters, how many navel orange trees are there in this navel orange orchard?
一个长方形的脐橙园，长45米，宽20米．如果每棵脐橙树占地3平方米，这个脐橙园一共有多少棵脐橙树？
<gadget id="calculator">20 / 3</gadget>
<output>20/3 = around 6.666667</output>

<gadget id="calculator">45 * (20/3)</gadget>
<output>300</output>

<result>300</result>