In 1/3 cup of walnuts, she makes 1 serving of salad
Therefore, In 1 cup of walnuts, she makes 3 servings of sald.
And hence in 2 cups of walnuts, she makes 2*3 = 6 serving of salad.
So the answer of the given question is , if she has 2 cups of walnus, then she makes 6 serving of salad .