The mean of five numbers is 18. If one number is excluded, then their mean is 16, the excluded number is______?

The correct option is B) Mean of 5 numbers =18 ⇒ Sum of these 5 numbers =18×5=90 Let the number that has been excluded be x New mean = 4 90−x ​ =16 Solving this, we get 90−x=64 ∴x=26