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Number of boys in class IX = 42 × (9/14) = 27 Number of girls in class IX = 42 × (5/14) = 15 Again, Number of boys in class X = 45 × (8/15) = 24 Number of girls in class X = 45 × (7/15) = 21 Total of boys in two classes = 27 + 24 = 51 Total of girls in two classes = 15 + 21 = 36 Difference = 51 - 36 = 15 ∴ The difference between the total number of boys and the total number of girls in both the classes taken together is 15.
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