A rectangular fish pond is 180 meters long and 60 meters wide, and a tree is planted every 6 meters. How many trees should be planted in total?
一个长方形鱼塘长180米，宽60米，每6米栽一棵树，一共要栽多少棵树．
<gadget id="calculator">180 + 60</gadget>
<output>240</output>

<gadget id="calculator">2 / 6</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">240 * (1/3)</gadget>
<output>80</output>

<result>80</result>