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Let the number of girls in the class = 'x'
Then, number of boys in the class = (x + 8)
So, x + x + 8 = 140
Or, x = (140 - 8) ÷ 2 = 66
So, number of girls and number of boys in the class are 66 and 74, respectively.
Therefore, required ratio = (66 + 4):(74 + 6) = 70:80 = 7:8
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