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On Monday, a class has 8 girls and 20 boys. On Tuesday, a certain number of girls joined the class just as twice that number of boys left the class, changing the ratio of girls to boys to 7 to 4. How many boys left the class on Tuesday? (A) 5 (B) 6 (C) 11 (D) 12 (E) 18 From Manhattan prep. Question, which # is bigger? number of boys left the class or number of girls joined the class?? Thx