There are 24 boys in the sixth grade. The ratio of boys to girls is 3:4. What is the size of the class?
六年级有男生24人，男生和女生人数的比是3：4，全班人数是多少人
<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">24 / (3/7)</gadget>
<output>56</output>

<result>56</result>