There are 142 desks in the school that need to be repaired. Master Liu led the repair team to repair them for a week and there are only 2 desks left. How many desks does the repair team repair on average per day?
学校有142张课桌需要修理，刘师傅带领修理小组修理一周后还剩2张．修理小组平均每天修理多少张课桌？
<gadget id="calculator">142 - 2</gadget>
<output>140</output>

<gadget id="calculator">140 / 7</gadget>
<output>20</output>

<result>20</result>