Simple Math Question.

[MisterW]

width, W = 36'-8"
length, L = 78'-4"

2 equations, 2 variables, solve

2*W + 2*L = 230'-0"
2*W = L - 5

Pick an equation, solve for L in terms of W or W in terms of L (for example, rearrange equation 2 such that L = 2*W +5)

Substitute the variable you solved for into the other equation (for example, replace L in equation 1 with 2*W + 5)

Solve for W, then use this value in one of the equations to solve for L