During the summer vacation, 120 students in the fifth grade participated in the wilderness survival training camp, 10 more than twice as many as in the fourth grade. How many people in 4th grade attend?
暑假里五年级有120名学生参加了野外生存训练营，比四年级的2倍多10人．四年级有多少人参加？
<gadget id="calculator">120 - 10</gadget>
<output>110</output>

<gadget id="calculator">110 / 2</gadget>
<output>55</output>

<result>55</result>