Question 180444: The average of five numbers is 18. Four of the five numbers are 21,22,19,8. What is the other number? Answer by Mathtut(3670) (Show Source):
You can put this solution on YOUR website! (21+22+19+8+x)/5=18
:
remember the avg is found by adding the terms together and then dividing by the number of terms. x is one of those values that has to be added to the rest to find the average which in our case we know to be 18
:
70+x=90......added terms and multiplied both sides by 5
: ....subtracted 70 from both sides
(