Let the middle number = X
The other two numbers are even so the lowest number would be X -2, and the highest number would be X +2.
9 times the first number ( lowest number) would be 9(x-2) = 9x-18
The sum of the other two numbers becomes x + x+2 = 2x+2
The first number is 8 more so now you have an equation of :
9x-18 = 2x+2 +8
Combine like terms on the right side:
9x-18 = 2x+10
Add 18 to both sides:
9x = 2x + 28
Subtract 2x from each side:
7x = 28
Divide both sides by 7:
X = 28 / 7 = 4
The middle number is 4.
The lowest number = X-2 = 4-2 = 2
The highest number = X+2 = 4+2 = 6
The 3 numbers are 2,4 & 6
