Jose has scored  79 ,  84 , and  85  on his previous three tests. What score does he need on his next test so that his average (mean) is  80 ?

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter3: Multi-step Equations And Inequalities
Section: Chapter Questions
Problem 12PTTS
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Jose has scored 
79
84
, and 
85
 on his previous three tests. What score does he need on his next test so that his average (mean) is 
80
?
 
 
 
 
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