There are 60000 people in a town.70% of the population are a

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There are 60000 people in a town.70% of the population are adults.
If 2000 babies were born and 2000 adults died,what is the mew percentage of adults in the town?

这个是数学题么.
一个镇有60000人,70%是成年人.如果有2000个婴儿出生,2000个成年人去世,那么镇上成年人的比例是多少?
原有成年人：60000×70%=42000
现有成年人：42000-2000=40000
现在的总人口：60000-2000（去世的成年人）+2000（出生的婴儿）=60000
现在成年人的比例：40000/60000=2/3

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