There are 240 students in the first grade of a certain elementary school, which is 80 students less than twice the number of the sixth grade. How many people are there in the sixth grade?
某小学一年级有240人，比六年级人数的2倍少80人，六年级有几个人？
<gadget id="calculator">240 + 80</gadget>
<output>320</output>

<gadget id="calculator">320 / 2</gadget>
<output>160</output>

<result>160</result>