In a math test in a certain class, the average score is 78 points, and the average scores of boys and girls are 75.5 and 81 points respectively. How many times the number of boys in this class is the number of girls?
某班在一次数学考试中，平均成绩是78分，男、女生各自的平均成绩是75.5和81分，这个班男生人数是女生人数的几倍？
<gadget id="calculator">3 / 2.5</gadget>
<output>1.2</output>

<result>1.2</result>