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The average score of a class of boys and girls in an examination is A. The ratio of boys and girls in the class is 3 : 1. If the average score of the boys is A + 1, the average score of the girls is-

A. A – 1 B. A – 3 C. A + 1 D. A + 3 Answer: Option B
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Solution(By Apex Team)

Let the number of boys and girls in the class be 3x and x respectively. Let the average score of the girls be y. Then, $\begin{array}{l}\text{⇒ 3x (A + 1) + xy = (3x + x) A}\\ \text{⇒ 3 (A + 1) y = 4A}\\ \text{⇒ y = A – 3}\end{array}$

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