A square apple orchard has a side length of 120 meters and one apple tree is planted every 4 square meters. How many apple trees are there in this apple orchard?
一个正方形的苹果园边长为120米，每4平方米种一棵苹果树．这个苹果园共有多少棵苹果树？
<gadget id="calculator">120 / 4</gadget>
<output>30</output>

<gadget id="calculator">120 * 30</gadget>
<output>3_600</output>

<result>3_600</result>