Given:
Ratio of boys and girls in the class = 5 : 7
Solution:
Let the number of the girls in the class = 7 x
the number of the boys in the class = 5x
According to the question,
7x - 5x = 6
x = 3
Then total number of the students in the class = 7x + 5x = 12x = 123 = 36
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