Combine 3 girls and 4 boys into a group, how many girls account for the total number of the group
把3个女孩和4个男孩合并成为一组，女孩占这组总数的多少
<gadget id="calculator">4 + 3</gadget>
<output>7</output>

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

<result>3/7 = around 0.428571</result>