In a certain medical test designed to measure carbohydrate tolerance, an adult drinks 5 ounces of a 20% glucose solution. When the test is administered to a child, the glucose concentration must be decreased to 10%. How much 20% glucose solution and how much water should be used to prepare 5 ounces of 10% glucose solution?

2.5 ounces of 20% glucose and 2. 5 ounces of water should be used to prepare 10% glucose.

Explanation:

          Given      =        Required

        C1xV1         =          C2xV2

       20 x  V1       =          10  x   5  

                V1       =       (10  x   5) / 20

                           =       2.5 ounces of 20% glucose

Dilution factor  = total amount - V1 (amount of given)

                         = 5 - 2.5

                         =  2.5 ounces

Take 2.5 ounces of 20% glucose and make up the total amount upto 5 ounces by adding 2.5 ounces of water.

Also simply as the percentage concentration is reduced by half so 1:2 dilution is used which means 2.5 ounces of 20% glucose with 2.5 ounces of water will give total of 5 aunces of solution

2.5: 5 = 1:2

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