There are two groups of students skipping rope. The first group has 25 people, and each person jumps 80 times on average; ?
两组同学跳绳，第一组有25人，平均每人跳80下；第二组有20人，平均每人比两组同学跳的平均数多5下，两组同学平均每人跳几下？
<gadget id="calculator">20 * 5</gadget>
<output>100</output>

<gadget id="calculator">100 / 25</gadget>
<output>4</output>

<gadget id="calculator">80 + 4</gadget>
<output>84</output>

<result>84</result>