50 students in the sixth grade participated in the mathematics competition, with an average score of 63 points. Among them, the average score of boys is 60 points, and the average score of girls is 70 points. How many more boys are there than girls?
六年级50名学生参加数学竞赛，平均分为63分，其中男生平均分60分，女生平均分70分，男生人数比女生数多多少名．
<gadget id="calculator">70 * 50</gadget>
<output>3_500</output>

<gadget id="calculator">63 * 50</gadget>
<output>3_150</output>

<gadget id="calculator">3_500 - 3_150</gadget>
<output>350</output>

<gadget id="calculator">70 - 60</gadget>
<output>10</output>

<gadget id="calculator">350 / 10</gadget>
<output>35</output>

<gadget id="calculator">50 - 35</gadget>
<output>15</output>

<gadget id="calculator">35 - 15</gadget>
<output>20</output>

<result>20</result>