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Answer:
1.) 40% of the students use the internet for 4-6 hours.
2.) At least 20% of the students use the internet for 7 hours.
3.) 40% of the students use internet for 6 hours.
4.) Ratio of students who preferred to work for 0-3 hours to 7-9 hours: 3:2.
Fraction of pupils who liked to use internet for 0-3 hours to 4-6 hours: 3/4.
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