Which equation could be used to solve for the measure of

Given in the question,
a.) △LMN
b.) ∠L is triple ∠M
c.) ∠N is double ∠M
From the given relationship, let's put them into an expression:
∠L is triple ∠M:
[tex]\angle L\text{ = 3}\angle M[/tex]∠N is double ∠M:
[tex]\angle N\text{ = 2}\angle M[/tex]Let's recall that the sum of all interior angles of a triangle is 180°. Thus, in expression, we get:
[tex]\angle L\text{ + }\angle M\text{ + }\angle N=180^{\circ}[/tex]Substituting the equivalent ratio of ∠L and∠N with respect to ∠M, we get:
[tex]\text{3}\angle M\text{ + }\angle M\text{ + 2}\angle M=180^{\circ}\text{ }\rightarrow\text{ }\angle M\text{ + 3}\angle M\text{ + 2}\angle M=180^{\circ}[/tex]Therefore, the answer is letter A.