There were originally 45 students in Class 6 and 2, and 15 girls were transferred. Later, a few girls were transferred. At this time, girls accounted for 40% of the class. How many girls were transferred?
六2班原有45名同学，女生有15名，后来又转来几名女生，这时女生占全班人数的40%，转来几名女生？
<gadget id="calculator">45 - 15</gadget>
<output>30</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">30 / (3/5)</gadget>
<output>50</output>

<gadget id="calculator">50 - 45</gadget>
<output>5</output>

<result>5</result>