q=45
Explanation
Step 1
the sum of the internal angles of a triangle must be 180 , then
[tex]\begin{gathered} 3q+q+q=180 \\ \\ \\ \end{gathered}[/tex]
Step 2
add similar terms
[tex]\begin{gathered} 3q+q+q=180 \\ 4q=180 \end{gathered}[/tex]
Step 3
divide both sides by 4
[tex]\begin{gathered} 4q=180 \\ \frac{4q}{4}=\frac{180}{4} \\ q=45 \end{gathered}[/tex]
I hope this helps you.
