The number of students in the upper grades of Yuhong Primary School accounts for 36% of the total number of students in the school, the number of students in the middle grades is the upper grades (5/9), and the number of students in the lower grades is 84 more than that of the middle grades. How many students are there in Yuhong Primary School?
育红小学高年级学生人数占全校学生总数的36%，中年级学生人数是高年级的(5/9)，低年级比中年级多84人，育红小学共有学生多少人？
<gadget id="calculator">36 / 100</gadget>
<output>9/25 = around 0.36</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">(9/25) * (5/9)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (9/25) - (1/5)</gadget>
<output>11/25 = around 0.44</output>

<gadget id="calculator">(11/25) - (1/5)</gadget>
<output>6/25 = around 0.24</output>

<gadget id="calculator">84 / (6/25)</gadget>
<output>350</output>

<result>350</result>