There are 63 boys in the sixth grade, which is 7/8 of the number of girls. How many more girls than boys?
六年级有男生63人，是女生人数的(7/8)，女生比男生多多少人？
<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">63 / (7/8)</gadget>
<output>72</output>

<gadget id="calculator">72 - 63</gadget>
<output>9</output>

<result>9</result>