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A television commercial advertises that a certain type of light bulb will last, on the average, 200 hours longer than three times the life of

A television commercial advertises that a certain type of light bulb will last, on the average, 200 hours longer than three times the life of another type of bulb. If consumer tests show that the advertised bulb lasts 4700 hours, how many hours must the other type of bulb last for the advertisers claim to be valid?

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