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The ratio of the population of village A to that of village B is 4:7.
Some people left village A and village B.
It was then observed that `1/2`of the population of village A had left for the city and there were 100 people who remained in village B.
As a result, the ratio of the population of village A to village B became 2:5.
What was the total population of village A and village B at first?