The stationery factory needs to bind 840 photo albums, which took 5 days to bind, and there is still a shortfall of 170. How many copies are bound every day on average?
文具厂要装订840本影集，装订了5天，还差170本，平均每天装订了多少本？
<gadget id="calculator">840 - 170</gadget>
<output>670</output>

<gadget id="calculator">670 / 5</gadget>
<output>134</output>

<result>134</result>