In a residential building, there were 3 air conditioners in the original house, and now there is an additional one. When all 4 air conditioners are turned on, the fuses will be blown, so at most 3 air conditioners can be used at the same time. In this way, how many hours can each household use the air conditioner on average within 24 hours.
一户居民住宅楼原有3户装空调，现又增加一户，这4台空调全部打开时就会烧断保险丝，因此最多只能同时用3台空调．这样，在24小时内平均每户可以使用空调多少小时．
<gadget id="calculator">24 / 4</gadget>
<output>6</output>

<gadget id="calculator">24 - 6</gadget>
<output>18</output>

<result>18</result>