In order to beautify the environment around the fish ponds, the Urban Construction Bureau decided to plant a tree every 20 meters along the six fish ponds with a circumference of 800 meters. How many trees can they plant at most?
为了美化鱼塘周边的环境，城建局决定沿着六个周长为800米的鱼塘一周，每20米栽一棵树，他们最多可以栽多少棵树．
<gadget id="calculator">800 / 20</gadget>
<output>40</output>

<gadget id="calculator">40 * 6</gadget>
<output>240</output>

<result>240</result>