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饮料的易拉罐是由铝制成的。40个易拉罐可以制成1千克铝。如果一个城市有500万户家庭,每个家庭每年所用易拉罐数量是60个,并全部回收,这个城市1年可以制成多少千克铝?这个问题就由我来解决。
Beverage cans are made of aluminum. 40 cans made of 1 kg aluminum. If there are 5 million households in a city and the number of cans used per household per year is 60 and all of them are recycled, how many kilograms of aluminum can be made in this city in a year? This problem is solved by me.