Two identical lamps A and B using different types of kerosene can completely utilize the same volume of oil in 12 hours and 8 hours respectively, due to the quality of oil used. If both of them start burning at the same time, then what will be the ratio of the amount of kerosene oil left in A and B after 4 hours?
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Economic activity is the activity of making, providing, purchasing, or selling goods or services. Any action that involves producing, distributing, or consuming products or services is an economic activity. ... Additionally, any activities involving money or the exchange of products or services are economic activities.
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