There are 180 students in the first grade of Experimental Primary School, accounting for 15% of the total number of students in the school. How many people are there in the whole school?
实验小学一年级有180名学生，占全校总人数的15%．全校共有多少人？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">180 / (3/20)</gadget>
<output>1_200</output>

<result>1_200</result>