Ram prepares solutions of alcohol in water according to customer’s needs. This morning Ram has prepared 27 litres of a 12% alcohol solution and kept it ready in a 27 litre delivery container to be shipped to the customer. Just before delivery, he finds out that the customer had asked for 27 litres of 21% alcohol solution. To prepare what the customer wants, Ram replaces a portion of 12% solution by 39%  solution. How many litres of 12% solution are replaced?

 

 

 

 

  • Option 1)

     

    5

     

  • Option 2)

     

    9

     

  • Option 3)

     

    11

     

  • Option 4)

     

    12

     

  • Option 5)

     

    10

     

Answers (1)

Direct solution

\left ( 27-x \right )X12+39x=27\times 21

324-12x +39x=567

27x = 233

X= 9L

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