The school organized students to plant trees. The sixth grade students planted 650 trees, 70 trees less than twice the number of fifth grade students. How many trees did the fifth grade students plant?
学校组织学生进行植树活动，六年级学生共植树650棵，比五年级学生植树棵数的2倍少70棵，五年级学生共植树多少棵？
<gadget id="calculator">650 + 70</gadget>
<output>720</output>

<gadget id="calculator">720 / 2</gadget>
<output>360</output>

<result>360</result>