Hope Primary School has 215 students in Grades 1, 2, and 3, and 305 students in Grades 3, 4, 5, and 6. The ratio of the number of students in Grade 3 to the total number of students in 6 grades in the school is 2:11. How many students are there in the school?
希望小学一、二、三年级共有学生215人，三、四、五、六年级共有学生305人，三年级人数与全校6个年级总人数的比是2：11，全校学生共有多少人？
<gadget id="calculator">215 + 305</gadget>
<output>520</output>

<gadget id="calculator">2 + 11</gadget>
<output>13</output>

<gadget id="calculator">520 / 13</gadget>
<output>40</output>

<gadget id="calculator">40 * 11</gadget>
<output>440</output>

<result>440</result>