There are 120 students in the fourth grade of Hongguang Primary School, twice as many students in the fifth grade as in the fourth grade, and 40 fewer students in the sixth grade than the sum of the fourth and fifth grades. How many students are there in grade six?
红光小学四年级有学生120人，五年级学生人数是四年级的2倍，六年级比四、五年级的总和少40人．六年级有学生多少人？
<gadget id="calculator">120 * 2</gadget>
<output>240</output>

<gadget id="calculator">240 - 40</gadget>
<output>200</output>

<gadget id="calculator">120 + 200</gadget>
<output>320</output>

<result>320</result>