A total of 560 teachers and students from Sunshine Elementary School participated in tree planting activities this year, which is 130 people less than three times the number of participants in last year's tree planting. How many teachers and students in this school participated in tree planting last year? (only list, no calculation)
阳光小学今年共有师生560人参加植树活动，比去年参加植树人数的3倍少130人，该学校去年参加植树的师生共有多少人？(只列式，不计算)
<gadget id="calculator">560 + 130</gadget>
<output>690</output>

<gadget id="calculator">690 / 3</gadget>
<output>230</output>

<result>230</result>