There are 28 students in Class 1 of Grade 6 in Experimental Primary School, accounting for 1/5 of the whole grade, and 2/9 of the students in Grade 6. How many students are there in the whole school?
实验小学6年级1班有学生28人，占全年级的(1/5)，六年级学生占全校的(2/9)，全校共有学生多少名？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">28 / (1/5) / (2/9)</gadget>
<output>630</output>

<result>630</result>