Answer: There is 12 servings of lemon juice needed for 36 cups of water.
Step-by-step explanation:
Since we have given that
Number of cups of water to make lemonade = 36
Ratio of lemon juice to water = 1 : 3
So, number of lemon juice cups be x
number of cups of water be 3x.
According to question, it becomes,
![3x=36\\\\x=\dfrac{36}{3}\\\\x=12](https://tex.z-dn.net/?f=3x%3D36%5C%5C%5C%5Cx%3D%5Cdfrac%7B36%7D%7B3%7D%5C%5C%5C%5Cx%3D12)
Hence, there is 12 servings of lemon juice needed for 36 cups of water.