Plant trees on both sides of the road, and plant 25 trees per kilometer on each side. This road is 120 kilometers long. How many trees are planted in total?
公路两边植树，每边每千米要植树25棵，这条路长120千米，一共植树多少棵？
<gadget id="calculator">120 * 25 * 2</gadget>
<output>6_000</output>

<result>6_000</result>