The students in class 41 are divided into two teams of men and women to compete in rope skipping. In the specified time, the boys team has a total of 180 jumps, and the girls team has a total of 260 jumps. The number of boys and girls is exactly 20, and girls are more than boys on average How many jumps?
四1班学生分成男女两个队比赛跳绳，在规定的时间里，男生队共跳180个，女生队共跳260个，男女生队的人数正好都是20人，女生比男生平均每人多跳多少个？
<gadget id="calculator">260 / 20</gadget>
<output>13</output>

<gadget id="calculator">180 / 20</gadget>
<output>9</output>

<gadget id="calculator">13 - 9</gadget>
<output>4</output>

<result>4</result>