- 18
- 16
- 17
- 28

Option 1 : 18

Given:

Number = 7, 11, 23, x, 16

Average = 15

Formula used:

Average = Sum of element/No. of element

Calculation:

Average = Sum of element/No. of element

⇒ 15 = (7 + 11 + 23 + x + 16)/5

⇒ 15 = (x + 57)/5

⇒ 15 × 5 = x + 57

⇒ 75 = x + 57

⇒ x = 75 – 57 = 18

∴ The value of x is 18.

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