SOLUTION: The mean of 4 numbers is 88 what is the fourth number if three of them are 80,95 and 85

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Question 1006600: The mean of 4 numbers is 88 what is the fourth number if three of them are 80,95 and 85
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
x = fourth number

Add up the four test scores (80, 95, 85, x) then divide by 4 and set that result equal to 88. The equation you get is (80+95+85+x)/4 = 88. Now solve for x.

(80+95+85+x)/4 = 88
(260+x)/4 = 88
4*(260+x)/4 = 4*88
260+x = 352
x+260 = 352
x+260-260 = 352-260
x = 92

The fourth missing number is 92