The students planted 63 more trees in the first class than the second class, with 42 people in the first class, 8 trees per person on average, and 39 people in the second class, how many trees per person on average? (solution with equation)
同学们植树，一班比二班多植63棵，一班42人，平均每人植8棵，二班39人，平均每人植多少棵？(用方程解答)
<gadget id="calculator">42 * 8</gadget>
<output>336</output>

<gadget id="calculator">336 - 63</gadget>
<output>273</output>

<gadget id="calculator">273 / 39</gadget>
<output>7</output>

<result>7</result>