In a class of 50 students, the average age of girls is 12.3 years and that of boys is 12.5 years. If the average age of the class is 12.42 years, then the number of boys and girls respectively in the class are (a) (25, 25) (b) (20, 30) (c) (30, 20) (d) (35, 15) (e) (40, 10)
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20,30
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