There are 250 students in the fifth and sixth grades of Xingfu Primary School. The ratio of the number of students in the fifth and sixth grades is 12:13, and the number of students in the sixth grade accounts for (1/5) of the whole school. How many people are there in the school?
幸福小学五、六年级共有学生250人，五、六年级学生人数的比是12：13，六年级学生人数占全校人数的(1/5)．全校有多少人？
<gadget id="calculator">12 + 13</gadget>
<output>25</output>

<gadget id="calculator">13 / 25</gadget>
<output>13/25 = around 0.52</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(13/25) / (1/5)</gadget>
<output>13/5 = around 2.6</output>

<gadget id="calculator">250 * (13/5)</gadget>
<output>650</output>

<result>650</result>