# SOLUTION: The average (arithmetic mean) of a set of 5 numbers is 9.6. When a sixth number is added to the set, the average of the set becomes 9. What is the sixth number?

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 Click here to see ALL problems on Numbers Word Problems Question 463420: The average (arithmetic mean) of a set of 5 numbers is 9.6. When a sixth number is added to the set, the average of the set becomes 9. What is the sixth number?Answer by alicealc(281)   (Show Source): You can put this solution on YOUR website!(5 * 9.6 + x)/6 = 9 (48 + x) = 6 * 9 48 + x = 54 x = 54 - 48 = 6 so, the sixth number is 6