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Mean of 5 numbers is 18. Four numbers are 16, 18, 14, 22. The 5th number is?
  1. 18
  2. 19
  3. 20
  4. 21
Explanation

Mean of 5 numbers = 18

So total sum:

Given four numbers:
 16, 18, 14, 22

Sum:

16 + 18 + 14 + 22 = 70

5th number:

90 - 70 = 20

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