There are 54 tons of coal in the freight yard, which have been shipped out 4 times, and there are 6 tons left to be shipped. How many tons are shipped each time on average?
货场有煤54吨，已经运出4次，还剩6吨没运，平均每次运多少吨？
<gadget id="calculator">54 - 6</gadget>
<output>48</output>

<gadget id="calculator">48 / 4</gadget>
<output>12</output>

<result>12</result>