There are 48 students in a certain class, and 18 are girls. Later, how many girls are transferred. At this time, the number of girls accounts for 40% of the whole class.
某班有学生48人，女生有18人，后来又转来多少个女生，这时女生人数占全班人数的40%．
<gadget id="calculator">48 - 18</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 - 48</gadget>
<output>2</output>

<result>2</result>