### The mean of 5 numbers is 18. If one number is excluded, their mean is 16. Find the excluded number.

A. 25

B. 26

C. 27

D. 28

$\begin{array}{l}\text{Excluded number}\\ \text{= (18 × 5) – (16 × 4)}\\ \text{= 90 – 64}\\ \text{= 26}\end{array}$
$$\begin{array}{l}\text{Excluded number}\\ \text{= (18 × 5) – (16 × 4)}\\ \text{= 90 – 64}\\ \text{= 26}\end{array}$$