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Number of students in 4th and 5th class in the ratio 6:11. 40% in class 4 are girls and 48% in class 5 are girls. What percentage of students in both the classes are boys ?

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In a class of 60, where girls are twice that of boys, Kamal ranked seventeenth from the top. If there are 9 girls ahead of Kamal, how many boys are after him in rank?