Question:The quantity of water (in ml) needed to reduce `9` ml 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` ml 

`= (50/100 xx 9) ml`

`= 4.5 ml`, water` = 4.5 ml.`

Let the water to be added be x ml.

Then,`(4.5)/(9 + x) xx 100`

`= 30 ⇒ 450`

`= 270 + 30x ⇒ x = 6 ml`

+ Report

Irin Moni

Editor, VCampus

Your Name

Your Email

Type of Report
Spelling MistakeIncorrect AnswerGrammar MistakeContent MissingImproper Text FormatInsufficient AnswerDuplicate QuestionImproper Sentence StructureImproper Equation/FormulaOther

Description