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ATQ,
Let the amount of milk and water in the original mixture be 4x ml and 3x ml respectively.
Amount of milk in 105 ml of mixture = 4/7 × 105 = 60 ml
Amount of water in 105 ml of mixture = 105 – 60 = 45 ml
According to the question:
(3x – 45 + 210) = 2.25 × (4x – 60)
Or, 3x + 165 = 9x – 135
Or, 6x = 300
Or, x = 50
Original quantity of mixture = 7x = 7 × 50 = 350 ml
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