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 The average of 10 reading is 25.5. In this the average of first three is 20 and the next four is 26. If the eight reading is 5 less than the night one and also 8 less than the tenth one, then find the eight reading?
  • a)
    22
  • b)
    24
  • c)
    26
  • d)
    28
  • e)
    None of these
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
The average of 10 reading is 25.5. In this the average of first three ...
Answer – 3.26 Explanation : sum of all ten reading = 255 sum of first three = 60 and sum of next 4 = 104.
Sum of 8th , 9th and 10th reading = 91 = 3*x + 13 X = 26
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Most Upvoted Answer
The average of 10 reading is 25.5. In this the average of first three ...
Answer – 3.26 Explanation : sum of all ten reading = 255 sum of first three = 60 and sum of next 4 = 104.
Sum of 8th , 9th and 10th reading = 91 = 3*x + 13 X = 26
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Community Answer
The average of 10 reading is 25.5. In this the average of first three ...
Sum of 10 readings = 25.5*10 = 255
Sum of 1st 3 readings = 3*20 = 60
Sum of next 4 readings = 4*26 = 104
x8 reading = x9 - 5 = X10 - 8
x9 = x8 + 5
X10 = x8 + 8
Total Sum
60 + 104 + x8 + x8 + 5 + x8 + 8 = 255
3x8 = 78
x8 = 26
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