A class of 50 students took the English test, with an average score of 63, of which the average score for boys is 60, and the average score for girls is 70. How many more boys than girls?
某班50名学生参加英语考试，平均分为63分，其中男生平均60分，女生平均70分，男生比女生多多少人．
<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>