Find jl. (relationships in triangles)

well, let's notice that JM = MK, KN = NL, because of those tickmarks, that simply means that the segment MN is the midsegment of the triangle, and the midsegment of a triangle is half  of the parallel base, namely

step-by-step explanation:

because 1/3 is a fraction. we can tell because there is a divisor symbol between the 1 and the 3. if we were to add 2 fractions together, we would add the numerators, which is the number on top, but not the denominators, which is the number on the bottom

1/3+1/3=2/3

hope this !