There are 120 girls in the first grade of Guangming Primary School, and boys account for 4/9 of the total number. How many students are there in the first grade?
光明小学一年级有女生120人，男生占总人数的(4/9)，一年级共有学生多少人？
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">1 - (4/9)</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">120 / (5/9)</gadget>
<output>216</output>

<result>216</result>