Question 55

The amount of water (in ml) that should be added to reduce 9 ml lotion, containing 50% alcohol, to a lotion containing 30% alcohol, is

Solution

Lotion = 9 ml

Alcohol = 4.5 ml

water = 4.5 ml

Let water be added is x ml

so, x + 4.5 = 70% of (9 + x) [since alcohol is 30%, so water is (100-30) = 70%]

x = 6 ml

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