SOLUTION: the average of six consecutive in integers in increasing order of size is 9.5. what is he average of the last 3 integers?

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Question 738203: the average of six consecutive in integers in increasing order of size is 9.5. what is he average of the last 3 integers?
Answer by mananth(16949) About Me  (Show Source):
You can put this solution on YOUR website!
let the numbers be x,x+1,x+2,x+3,x+4,x+5
Total = 6x+15
numbers = 6
average = 9.5 = (6x+15)/6
multiply by 6
57=6x+15
-15
42=6x
/6
x=7
the numbers are 7,8,9,10,11,12
10+11+12=33
33/3=11
average of last three numbers is 11