The quantity of brown sugar required to make one cookie from the given parameter is; 1/10 cups.
We are told that the recipe calls for 3/5 of cup of brown sugar.
Now, this quantity of brown sugar is said to make 6 cookies. Thus;
If 6 cookies is made with 3/5 cup of brown sugar, then;
1 cookie will be made wit; (1 * 3/5)/6 = 3/30 = 1/10 cup of brown sugar
Thus, the quantity of brown sugar required to make one cookie is 1/10 cups.
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