How many liters of the mixture from a 90 liter bottle full of 90% concentrated milk has to be replaced with water to make the resultant 60% concentrated?
Explanation:
Let ‘r’ litres is removed and replaced with water.
∴ 60 = 90 × 1-r90
⇒ 23 = 1 - r90
⇒ r = 30 litres.
Hence, option (c).
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