Question
The average score of a class of boys and girls in
examination is X. The ratio of boys and girls in the class is 4:3. If the average score of the boys (X + 2), the average score of the girls is:Solution
Let there be 4n boys and 3n girls Total score = (4n + 3n)
X = 7nX Total score of boys = 4n(X + 2) = 4nX + 8n Total score of girls = 7nX – (4nX + 8n) = (3nX – 8n) Average score of girls = ((3nX – 8n))/3n =  (3X - 8)/3
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