There are 320 students in the upper grades of a certain elementary school, accounting for 4/11 of the total number of students in the school, and 25% of the students in the lower grades. How many students are there in the lower grades?
某小学高年级有320人，占全校总人数的(4/11)，低年级是全校人数的25%，低年级有学生多少人？
<gadget id="calculator">4 / 11</gadget>
<output>4/11 = around 0.363636</output>

<gadget id="calculator">320 / (4/11)</gadget>
<output>880</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">880 * (1/4)</gadget>
<output>220</output>

<result>220</result>