Explanation

Let g = the number of cars that the Green lot can hold. Let r = the number of cars that the Red lot can hold

The first two sentences can be translated into two equations:

\(g + r = 115\)

\(g = r - 35\)

The question asks for r, so substitute (r – 35) for g in the first equation:

\((r - 35) + r = 115\)

\(2r - 35 = 115\)

\(2r = 150\)

\(r = 75\)

Hence option D is correct!

We can let n = the number of cars the Red lot can hold and create the equation:

n + n - 35 = 115

2n = 150

n = 75

Answer: D