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• In Mr. Prime's class, 6/10 of the students had done their homework. Of these 2/3 had all correct answers. What fraction of the whole class had all correct answers?
  
• There are 950 students at Hanover High School. The ratio of the number of freshmen to all students is 3:10. The ratio of the number of sophomores to all students is 1:2. What is the ratio of the number of freshmen to sophomores?