Qingqing Huamu Company planted 520 rows of camphor trees and 285 rows of ginkgo trees, each with 60 trees. How many of these two trees are there?
青青花木公司种植了520行樟树和285行银杏树，每行都是60棵．这两种树共有多少棵？
<gadget id="calculator">60 * 520</gadget>
<output>31_200</output>

<gadget id="calculator">60 * 285</gadget>
<output>17_100</output>

<gadget id="calculator">31_200 + 17_100</gadget>
<output>48_300</output>

<result>48_300</result>