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The Average score of A, B, and C in an examination is 53. A’s score is 15 less than that of D and 9 more than that of B. If D’s score is 30 more than the average score of A, B, and C. then what is the average score of A, B, and D?

The Average score of A, B, and C in an examination is 53. A’s score is 15 less than that of D and 9 more than that of B. If D’s score is 30 more than the average score of A, B, and C. then what is the average score of A, B, and D? Correct Answer 70

Let the score of A, B and C be A, B and C respectively.

⇒ A + B + C = 159

⇒ A = D – 15

⇒ A = B + 9

⇒ D = 30 + 53 = 83

⇒ A = 83 – 15 = 68

⇒ B = 59

Required average scores = (68 + 59 + 83)/3 = 70

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