A. 42
JN, which is the whole line, equals 78. We learned that JK, KL, and MN are all equal, and that LM equals three points.
So, there are 6 parts to the line in total. Dividing 78 by 6 gives you 13 for a sixth of the line.
Now, to find LN all you have to do is know that LM is 13 times three. And just add one more 13 from MN.
13 x 4 = 42 as your answer. I hope you were able to follow my explanation lol
