Last year we planted 205 trees, and this year we planted three times as many trees as last year. How many more trees are there this year than last year?
去年我们植树205棵，今年种的是去年的3倍，今年比去年多种多少棵？
<gadget id="calculator">205 * 3</gadget>
<output>615</output>

<gadget id="calculator">615 - 205</gadget>
<output>410</output>

<result>410</result>