There are 4,200 students in the Yingcai School, and the number of students in other grades is 7 times that of the sixth grade. How many students are there in the sixth grade?
英才学校有学生4200人，其他年级学生人数是六年级的7倍，六年级有学生多少人？
<gadget id="calculator">7 + 1</gadget>
<output>8</output>

<gadget id="calculator">4_200 / 8</gadget>
<output>525</output>

<result>525</result>