Answer
The number is $-30$.
Work Step by Step
Let $x$ be the unknown number.
Then, the quotient of a number and $3$ is represented as $\dfrac{x}{3}$.
Thus, the equation needed to find the unknown number is:
$$8+\frac{x}{3}=-2$$
Solve the equation:
$$\begin{align*}
8+\frac{x}{3}-8&=-2-8 &\text{Subtract 8 from each side.}\\
\frac{x}{3}&=-10 &\text{Simplify.}\\
3 \cdot \frac{x}{3}&=3(-10) &\text{Multiply 3 to both sides.}\\
x&=-30 &\text{Simplify.}
\end{align*}$$
Thus, the number is $-30$.
