A certain school has enrolled 315 first-year freshmen, 20% of whom are girls. It is planned to recruit another batch of girls so that girls will account for 30% of all freshmen. How many more girls are planned to recruit?
某校已招收一年级新生315人，其中女生占20%，计划再招一批女生，使女生占全体新生的30%，计划再招女生多少人？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">(4/5) / (7/10)</gadget>
<output>8/7 = around 1.142857</output>

<gadget id="calculator">315 * (8/7)</gadget>
<output>360</output>

<gadget id="calculator">360 - 315</gadget>
<output>45</output>

<result>45</result>