A pencil factory makes 50 cases of pencils in 5 hours. How long will the pencil factory spend making 55 cases?

If it takes 5 hours for 50 cases of pencils, then they make 10 cases per hour.
Which means 5 cases per 1/2 hour.
1/2 hour times 11. [ because 5 times 11.
Which equals 5 and 1/2 hours to make 55 cases ]

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