A swimming pool is 50 meters long, Xiao Gang swam 6 back and forth, Xiao Ming swam 320 meters, how many meters did Xiao Ming swim less than Xiao Gang?
一个游泳池长50米，小刚游了6个来回，小明游了320米，小明比小刚少游了多少米？
<gadget id="calculator">2 * 6 * 50</gadget>
<output>600</output>

<gadget id="calculator">600 - 320</gadget>
<output>280</output>

<result>280</result>