Correct Answer - Option 4 : 175 liters
Given:
The ratio of milk and water is 7 ∶ 4
After adding 5 liters of water, the ratio of milk and water is 5 ∶ 3
Calculation:
Let the quantity of milk and water be 7x and 4x
According to the question, we have,
⇒ 7x/(4x + 5) = 5/3
⇒ 21x = 20x + 25
⇒ 21x - 20x = 25
⇒ x = 25
Now, the initial quantity of milk is
⇒ 7x = 7 × 25
⇒ 175 liters
∴ The quantity of milk in the initial mixture is 175 liters.