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Q.
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 ?
A.
6 ml
B.
11 ml
C.
15 ml
D.
9 ml
View Answer
Correct choice: A
Explanation:
Let us assume that the lotion has 50% alcohol and 50% water. ratio = 1:1 As the total solution is 9ml alcohol = water = 4.5ml Now if we want the quantity of alcohol = 30% The quantity of water = 70% The new ratio = 3:7 Let x ml of water be added We get, 4.54.5+x = 37 => x=6 Hence 6ml of water is added.
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