Question
A tank contains 80 litres of a mixture of milk and
water in the ratio 3 : 1 . If 20 litres of this mixture is removed and replaced with water, what is the ratio of milk to water in the final mixture?Solution
Initial mixture = 80 L; Milk : Water = 3 : 1 Milk = (3/4) × 80 = 60 L Water = 20 L 20 L mixture removed: Milk removed = (3/4) × 20 = 15 L Water removed = (1/4) × 20 = 5 L Milk left = 60 − 15 = 45 L Water left = 20 − 5 = 15 L Now 20 L water added: New water = 15 + 20 = 35 L Total = 45 (milk) + 35 (water) = 80 L Required ratio = 45 : 35 = 9 : 7
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State true/false
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