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-

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INSURANCE EXAMS (NICL) 2013 click here to view all questions

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-

AA - 1

BA - 3

CA + 1

DA + 3

Nithin ? undefined

Correct answer is: A - 3

Explanation:

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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Correct answer is: A - 3 Explanation: 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 Nithin ? answered undefined All Comments

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