A parking fee of at least 0.5 yuan is required to park a car in a parking lot. If the parking exceeds 1 hour, an additional 0.5 yuan will be charged for every 0.5 hours of parking. This car has paid a total of 5.5 yuan. ．
一个停车场停一次车至少要交0.5元的停车费，如果停车超时1小时，每多停0.5小时就要多交0.5元，这辆车一共交了5.5元，这辆车一共停了多少小时．
<gadget id="calculator">5.5 - 0.5</gadget>
<output>5</output>

<gadget id="calculator">0.5 / 0.5</gadget>
<output>1</output>

<gadget id="calculator">5 / 1</gadget>
<output>5</output>

<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<result>6</result>