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An advertising firm has an old computer that can prepare a whole mailing in 6 hours. with the of newer model the job is complete in 2 hours. how long would it take the newer model to do the job alone?
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School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?
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What is 9 3/4 as a percentage...
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