If the average of x + 3, x + 6 and x + 9 is 0 then x = ____?
- -9
- -3
- -6
- None of these
Explanation
Given:
Average of x + 3, x + 6, and x + 9 is 0
((x + 3) + (x + 6) + (x + 9)) / 3 = 0
Combine like terms:
(3x + 18) / 3 = 0
Multiply both sides by 3:
3x + 18 = 0
Subtract 18 from both sides:
3x = -18
Divide by 3:
x = -6
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