Last year, Liangcai School planted 600 trees in May, three times more than in April. How many trees were planted in April?
梁才学校去年为绿化校园，五月份栽树600棵，比四月份的3倍还多60棵，四月份栽树多少棵？
<gadget id="calculator">600 - 60</gadget>
<output>540</output>

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

<result>180</result>