SOLUTION: what number must be added to 20,25,37 and 45 to get an average of 31

Question 936587: what number must be added to 20,25,37 and 45 to get an average of 31
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
(20+25+37+45+x)/5 = 31
(20+25+37+45)+x = 31*5
x = 31*5 - (20+25+37+45)
x = 28
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