Given the following question:
We are given a cookie recipe that takes 5/3 cups of sugar, 4 eggs, 8/3 tbs salt, 10/3 cup of chocolate chips to make.
We need to come up with a new recipe to be able to make 4 batches of cookies, to find this answer we multiply the fractions by 4, since we are trying to make 4 batches of cookies.
We need 6 2/3 cups of sugar, 16 eggs, 10 2/3 tbs of salt, and 13 1/3 chocolate chips to make four batches of cookies.
Now for the second question:
We now want a recipe to only make enough cookies for just you, and we want to make 1/2 the orginal recipe, to make this new recipe.
To find the answer we divide the recipe by 1/2.