There are 120 boys in the sixth grade of a certain school, and the number of girls is 7/8 of the number of boys. It is known that the number of sixth grades accounts for 25% of the total number of students in the school. How many students are there in this school?
某校六年级有男生120人，女生人数是男生人数的(7/8)，已知六年级人数占全校人数的25%．这个学校共有学生多少人？
<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">120 * (7/8)</gadget>
<output>105</output>

<gadget id="calculator">105 + 120</gadget>
<output>225</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">225 / (1/4)</gadget>
<output>900</output>

<result>900</result>