A pile of coal is 72.4 tons, and 17.6 tons are shipped out. How much more tons are the remaining than the shipped out?
一堆煤72.4吨，运出17.6吨，余下的比运出的多多少吨？
<gadget id="calculator">72.4 - 17.6 - 17.6</gadget>
<output>37.2</output>

<result>37.2</result>