Juan needs 10 half-gallons of milk to bake 40 cookies with. How many half-gallons of milk does Juan need to bake 200 dozen cookies? Give me reasons, before answering the question

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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If 10 half - gallons of milk bake 40 cookies, then one half - gallon of milk bakes 40 / 10 = 4 cookies. If one half - gallon of milk bakes 4 cookies. to bake 200 cookies, you'll need 200 / 4 = 50 half - gallons of milk. So the final answer is 50.