The average score of a class of boys and girls in…

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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-

  1. A. A – 1
  2. B. A – 3
  3. C. A + 1
  4. D. A + 3

Answer: Option B

Here is complete explanation of The average score of a class of boys and girls in….

Solution(By ExamCraze 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,
⇒ 3x (A + 1) + xy = (3x + x) A
⇒ 3 (A + 1) y = 4A
⇒ y = A - 3

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