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Answer»

The average number of boys in 8 classes of a school is 42.

So, total number of boys = 8 × 42 = 336

If in three of the classes, 4 boys are replaced by GIRLS, the number of boys will decrease by 12, and number of girls will increase by 12.

Now, average number of girls BECOMES 47.5.

⇒ Total number of girls = 8 × 47.5 = 380

⇒ Total number of students = (336 – 12) + 380 = 704



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