There is a residential building with 10 families living in it. A cuboid-shaped reservoir was built on the roof, measuring 3.2 meters long, 2.5 meters wide and 2 meters high. If the average household uses 0.2 cubic meters of water per day, how many days can this residential building be supplied with water when the reservoir is filled with water?
有一幢居民住宅楼，共住10户人家．屋顶建了一个长方体状的蓄水池，从里面量长3.2米，宽是2.5米，高是2米．如果平均每户每天用水0.2立方米，这个蓄水池灌满水时，可供这幢居民楼用水多少天？
<gadget id="calculator">3.2 * 2.5 * 2</gadget>
<output>16</output>

<gadget id="calculator">0.2 * 10</gadget>
<output>2</output>

<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<result>8</result>