The amount of water in ml that should be added to reduce 9 ml lotion containing 50 alcohol to a loti......

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 ?

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,
4.5 /4.5+x = 3/7
x=6ml
Hence, option 1 is the correct answer.

By: Amit Kumar