Multiple Choice Questions on How many pure salts must be added to 50kg of 5 solution of salt and water to increase it to a 20 sol........... for CDS Exam Preparation

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Multiple Choice Questions

How many pure salts must be added to 50kg of 5 solution of salt and water to increase it to a 20 sol...........

Quantitative Aptitude (CDS) Percentage
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    How many pure salts must be added to 50kg of 5% solution of salt and water to increase it to a 20% solution?

     

    87/5 kg
     

    Incorrect Answer

    75/8 kg
     

    Correct Answer

    57/8 kg 
     

    Incorrect Answer

    85/7 kg

    Incorrect Answer
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    Explanation:

    Amount  of salt in 50 kg solution= (5/100)50kg = 2.5
    Let x kg of pure salt be added.
    Then,  (2.5+x)/(50+x)= 20/100
    250+100x =  1000+20x
    80x=750
    x = 750/80 = 75/8 kg

    By: bhavesh kumar singh
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