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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
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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