The students do good deeds, 42 people in each of the first class of five years and the second class of five years. The five-year class one did a total of 336 good deeds, and the five-year class two did a total of 210 good deeds. How many more good deeds does each person in class one do on average than in class two?
同学们做好事，五年一班和五年二班各42人．五年一班一共做了336件好事，五年二班一共做了210件好事．一班比二班平均每人多做多少件好事？
<gadget id="calculator">336 / 42</gadget>
<output>8</output>

<gadget id="calculator">210 / 42</gadget>
<output>5</output>

<gadget id="calculator">8 - 5</gadget>
<output>3</output>

<result>3</result>