The number of boys in class one of the sixth grade accounts for 4/7 of the total number of the class. There are 24 boys and how many girls are there.
六年级一班男生人数占全班总人数的(4/7)，男生有24人，女生有多少人．
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

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

<gadget id="calculator">42 - 24</gadget>
<output>18</output>

<result>18</result>