kettle is made of aluminum and weighs 500 grams each. The cans of a certain beverage are also made of aluminum, and 40 cans can be made into 1 kg of aluminum. There are 150,000 households in Kecheng District. If there are 3 people in each family on average, and each person drinks 20 cans per year, and all these cans are recycled into aluminum, how many aluminum water bottles can be made from this aluminum?
一种水壶是由铝制成的，每个重500克．某种饮料的易拉罐也是铝制成的，40个易拉罐可以制成1千克铝．柯城区有15万户家庭，如果平均每个家庭3人，每人每年喝20瓶易拉罐饮料，并把这些易拉罐全部回收制成铝，那么，这些铝能制造多少个铝制水壶？
<gadget id="calculator">500 / 1_000</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">20 / 40 / (1/2)</gadget>
<output>1</output>

<gadget id="calculator">15 * 10_000 * 3 * 1 * 10</gadget>
<output>4_500_000</output>

<result>4_500_000</result>