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  • Question
  • 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?


  • Options
  • A. 6 ml
  • B. 11 ml
  • C. 15 ml
  • D. 9 ml

  • Correct Answer
  • 6 ml 

    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 . 5 4 . 5 + x   =   3 7
    => x=6
    Hence 6ml of water is added.

  • Tags: GRE, GATE, CAT, Bank Exams, AIEEE, Bank PO, Bank Clerk, Analyst

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