In a mixture of 45 litres, the ratio of milk and water is 3 : 2, How much water must be added to make the ratio 9 : 11?

45 L

M= 3/5 x 45 = 27 L

W = 18 L

27 / 45 + X = 11/ 20

540 = 495 + 11X

11x= 55

X = 5L

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