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The ratio of three numbers A, B and C is 3 : 8 : 5, respectively, and the average of their squares is 7350. What is the value of the ratio (A + 5) : (C – 5)?
- a)5 : 7
- b)7 : 8
- c)5 : 6
- d)2 : 5
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
The ratio of three numbers A, B and C is 3 : 8 : 5, respectively, and ...
Let A = 3x, B = 8x and C = 5x
(3x)2 + (8x)2 + (5x)2 = 7350 × 3
x = 15
A = 45 and B = 75
(A + 5) : (B − 5) = 45 + 5 : 75 – 5 = 5 : 7
Hence, option A is correct.
(3x)2 + (8x)2 + (5x)2 = 7350 × 3
x = 15
A = 45 and B = 75
(A + 5) : (B − 5) = 45 + 5 : 75 – 5 = 5 : 7
Hence, option A is correct.
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