The school organized students to participate in the competition. There were 65 students in the fourth grade, and the number of participants in the fifth grade was twice that of the fourth grade. The sum of the number of participants in the fifth grade is 18 fewer than the number of participants in the sixth grade. How many people participated in the sixth grade?
学校组织同学参加比赛，四年级有65人参加，五年级参加的人数是四年级的2倍，四．五年级参加的人数的总和比六年级参加的人数少数18人，六年级参加多少人？
<gadget id="calculator">65 * 2</gadget>
<output>130</output>

<gadget id="calculator">65 + 130 + 18</gadget>
<output>213</output>

<result>213</result>