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Sticky Note
The average (arithmetic mean) of 5, 10, 15 and x is 20. What is the value of x?
  1. 10
  2. 15
  3. 20
  4. 50
Explanation

That makes it 4 x 20 to get the total sum which is 80

80=5+10+15+x

80–30=x

50=x

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