SOLUTION: 6 numbers have average 9, if the 6th number is deducted the resulting average is 10. What is the 6th number?

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Question 560594: 6 numbers have average 9, if the 6th number is deducted the resulting average is 10. What is the 6th number?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
6 numbers average =9
total = 6*9 =54
let the 6th number be x
(54-x)/5 = 10
54-x=50
x=54-50
x=4
6th number is 4