In a math test in a certain class, the average score is 78 points, the average score of boys is 77 points, and the average score of girls is 81 points, how many times the number of boys in this class is that of girls?
某班一次数学考试中，平均成绩是78分，其中男生的平均分是77分，女生的平均分是81分，这个班男生人数是女生的多少倍？
<gadget id="calculator">81 - 78</gadget>
<output>3</output>

<gadget id="calculator">78 - 77</gadget>
<output>1</output>

<gadget id="calculator">3 / 1</gadget>
<output>3</output>

<result>3</result>