A rectangular orchard is 500 meters long and 120 meters wide. It is necessary to plant fruit trees with a spacing of 4 meters and a row spacing of 5 meters. How many fruit trees can be planted in total?
一个长方形果园，长500米，宽120米，要栽果树，株距4米，行距5米，一共可以栽多少棵果树？
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">120 / 20</gadget>
<output>6</output>

<gadget id="calculator">500 * 6</gadget>
<output>3_000</output>

<result>3_000</result>