Two people, A and B, process the same kind of machine parts, and A processes 280 parts, which is 40 less than that processed by B in 5 days. How many pieces does B process per day on average? (column equation solution)
甲、乙两人加工同一种机器零件，甲加工了280个，比乙5天加工零件的个数少40个．乙平均每天加工多少个？(列方程解答)
<gadget id="calculator">280 + 40</gadget>
<output>320</output>

<gadget id="calculator">320 / 5</gadget>
<output>64</output>

<result>64</result>