There were originally 9 rows of motorcycles parked in the parking shed, with 9 motorcycles in each row. Now that 16 have been driven away, how many motorcycles are left in the parking shed?
停车棚里原来停有9排摩托车，每排9辆．现在有16辆被开走了，停车棚里还有多少辆摩托车？
<gadget id="calculator">9 * 9</gadget>
<output>81</output>

<gadget id="calculator">81 - 16</gadget>
<output>65</output>

<result>65</result>