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Rocco has a weekly reading schedule, reading for 4 hours per day on some days and 2 hours per day on the other days. He reads a total of 24 hours in a seven-day week. On how many days does he read for 4 hours?

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Interesting fact:

The frequently used international word “robot” first originated in Karel Čapek’s play Rossum’s Universal Robots. It derives from the Slavic word robota, which means labor (especially forced labor), and was used to denote humanoid, mass-produced, completely emotionless workers incapable of original thinking and indifferent to self-preservation.

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