There are 42 students in a class, girls account for (4/7), how many girls are there?
某班有学生42人，女生占(4/7)，女生有多少人．
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">42 * (4/7)</gadget>
<output>24</output>

<result>24</result>