Two engineering teams, A and B, dug a 2,640-meter-long tunnel from both ends of the mountain at the same time, and it took 80 days to get through. It is known that team A digs 3 meters more than team B every day, how many meters does team A dig on average per day? (calculated by equation)
甲乙两个工程队同时从山的两端开凿一条长2640米的隧道，80天打通．已知甲队比乙队每天多开凿3米，甲队平均每天开凿多少米？(用方程计算)
<gadget id="calculator">3 * 80</gadget>
<output>240</output>

<gadget id="calculator">240 + 2_640</gadget>
<output>2_880</output>

<gadget id="calculator">80 + 80</gadget>
<output>160</output>

<gadget id="calculator">2_880 / 160</gadget>
<output>18</output>

<result>18</result>