There are 240 students in the fifth grade of Guangming Primary School, which is less than the sixth grade (1/7). How many students are there in the sixth grade?
光明小学五年级有学生240人，比六年级少(1/7)，六年级有多少人？
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 - (1/7)</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">240 / (6/7)</gadget>
<output>280</output>

<result>280</result>