Answer:
The number, n, is -15
Explanation:
We can allow n to represent the unknown number. The quotient of the number and 3 is n / 3 and nine more than this is (n / 3) + 9.
Now we can set (n / 3) + 9 equal to 0 to solve for n, the value of the unknown number:
(n / 3) + 9 = 4
n / 3 = -5
n = -15
Thus, the number is -15.