There are 180 students in the sixth grade of a certain elementary school, which happens to be 2/9 of the total number of students in the school. How many students are there in this school?
某小学六年级有学生180人，正好是全校学生人数的(2/9)，这所学校共有学生多少人？
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">180 / (2/9)</gadget>
<output>810</output>

<result>810</result>