Question:The number of grams of water needed to reduce 9 grams of shaving lotion containing 50% alcohol to a lotion containing 30% alcohol, is : 

A 4 
B 5 
C 6 
D 7 

+ Answer
C 

+ Explanation
Alcohol in 9 gms` = (50/(100) xx 9)`

                          `= 4.5 gms.`

Let x gm of water be added. Then,

`(4.5)/(0 + x) xx 100`

`= 30 => 270 + 30x = 450 => x = 6 gms.`

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Irin Moni

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