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ATQ, Let the total number of students in class B = 4x Then, number of students in class A = 5x And number of students in class C = 6x Total number of girls in all three classes = 2/5 of 5x + 7/20 of 4x + 13/25 of 6x = 2x + 7x/5 + 78x/25 = 163x/25 
= 163 ×( 4/15) = 43.46 ~ 43.5%
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