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Castings are finished on a belt grinder. Twenty-five castings are finished per hour, and the grinder belt lasts 18 hours. If a higher-grade belt

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Castings are finished on a belt grinder. Twenty-five castings are finished per hour, and the grinder belt lasts 18 hours. If a higher-grade belt will last 30 hours, how many more castings can be finished on one grinder belt, using the higher-grade belt?

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