According to the question Alcohol contained in first glass = 3/5 Water contained in first glass = 2/5 Alcohol contained in second glass = 4/5 Water contained in second glass = 1/5 Now, the ratio of alcohol and water in the third glass ⇒ (3/5 + 4/5) : (2/5 + 1/5) ⇒ (7/5 : 3/5) ⇒ 7 : 3 ∴ The required ratio is 7 : 3