1. Correct Answer: Option D: 5 : 3
 2. Explanation:
     Let's assume the volume of each glass is V.
     ● Glass 1:  
           ○ Milk = \( \frac{1}{2}V \)
           ○ Water added = \( \frac{1}{2}V \) (to fill the glass to the brim)
     ● Glass 2:  
           ○ Milk = \( \frac{3}{4}V \)
           ○ Water added = \( \frac{1}{4}V \) (to fill the glass to the brim)
     Now, let's calculate the total amount of milk and water when the contents of both glasses are poured into another vessel:
     ● Total Milk:  
       \[
       \frac{1}{2}V + \frac{3}{4}V = \frac{2}{4}V + \frac{3}{4}V = \frac{5}{4}V
       \]
     ● Total Water:  
       \[
       \frac{1}{2}V + \frac{1}{4}V = \frac{2}{4}V + \frac{1}{4}V = \frac{3}{4}V
       \]
     Therefore, the ratio of milk to water in the vessel is:
     \[
     \frac{\frac{5}{4}V}{\frac{3}{4}V} = \frac{5}{4} \div \frac{3}{4} = \frac{5}{4} \times \frac{4}{3} = \frac{5}{3}
     \]
     Thus, the ratio of milk to water is 5 : 3.