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Sticky Note
If the average of 5,6,7 and X is 10. What is the value of 'X' ?
  1. 12
  2. 22
  3. 32
  4. 42
Explanation

Average of 5, 6, 7, and X = 10


Use the average formula:


(5 + 6 + 7 + X) / 4 = 10


Add the numbers:


(18 + X) / 4 = 10


Multiply both sides by 4:


18 + X = 40


Now solve for X:


X = 40 - 18 = 22


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