There are 45 students in a class, 40% of whom are boys, how many are girls?
某班有学生45人，其中男生占40%，女生有多少人．
<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">45 * (3/5)</gadget>
<output>27</output>

<result>27</result>