There is a truck transporting 1,000 vases. The freight is calculated based on the number of intact bottles upon arrival. Each vase is 50 cents. If there is any damage, the damaged bottle will not be paid for the freight and each will be compensated for 2 yuan. The result is a freight of 485 yuan. How many vases are broken?
有一辆货车运输1000只花瓶，运费按到达时完好的瓶子数目计算，每只5角，如有破损，破损瓶子不给运费还要每只赔偿2元，结果得到运费485元，这次运输中花瓶破损了几只？
<gadget id="calculator">1_000 * 0.5</gadget>
<output>500</output>

<gadget id="calculator">500 - 485</gadget>
<output>15</output>

<gadget id="calculator">2 + 0.5</gadget>
<output>2.5</output>

<gadget id="calculator">15 / 2.5</gadget>
<output>6</output>

<result>6</result>