There are 780 tons of coal in the freight yard, which have been shipped out 6 times, and there are 60 tons left to be shipped. How many tons are shipped on average each time?
货场有煤780吨，已经运出6次，还剩60吨没运，平均每次运多少吨？
<gadget id="calculator">780 - 60</gadget>
<output>720</output>

<gadget id="calculator">720 / 6</gadget>
<output>120</output>

<result>120</result>