ANSWER
n = 14
EXPLANATION
Let n be the number.
The quotient of a number and 15 is the number divided by 15:
[tex]\frac{n}{15}[/tex]And this added to 1/3 equals 19/15. The equation to solve is:
[tex]\frac{n}{15}+\frac{1}{3}=\frac{19}{15}[/tex]To solve for n first we have to subtract 1/3 from both sides of the equation:
[tex]\begin{gathered} \frac{n}{15}+\frac{1}{3}-\frac{1}{3}=\frac{19}{15}-\frac{1}{3} \\ \frac{n}{15}=\frac{19}{15}-\frac{5}{15} \\ \frac{n}{15}=\frac{14}{15} \end{gathered}[/tex]And then multiply both sides by 15:
[tex]\begin{gathered} \frac{n}{15}\cdot15=\frac{14}{15}\cdot15 \\ n=14 \end{gathered}[/tex]The mentioned number is 14