A triangular orchard is 180 meters long and 120 meters high. It is necessary to plant pear trees, one per 20 square meters, how many pear trees can be planted in total?
一个三角形的果园，长180米，高120米，要栽梨树，每20平方米栽一棵，一共可以栽梨树多少棵？
<gadget id="calculator">120 / 2 / 20</gadget>
<output>3</output>

<gadget id="calculator">180 * 3</gadget>
<output>540</output>

<result>540</result>