There are 4,500 students in the central primary school, and girls account for the total number of the school (9/25). Some girls are transferred in the new semester. At this time, girls account for 40% of the total number of students in the school. How many students are there now?
中心小学有学生4500人，女生占全校总数的(9/25)，新学期转来一些女生，这时女生占全校人数的40%，现在有学生多少人？
<gadget id="calculator">9 / 25</gadget>
<output>9/25 = around 0.36</output>

<gadget id="calculator">4_500 * (9/25)</gadget>
<output>1_620</output>

<gadget id="calculator">4_500 - 1_620</gadget>
<output>2_880</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">2_880 / (3/5)</gadget>
<output>4_800</output>

<result>4_800</result>