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Fractions
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1.   Three labs measured the iron content of an ore sample sent to them by Terra-Chem, Inc. The first lab reported 10 mg of iron per cm3. The second lab reported a concentration of 4/5 that and the third lab reported a value of about 1 1/5 of the value reported by lab 2. What was the iron concentration reported by lab 3? Round your answer to the nearest hundredth of a milligram.

2.   A good tasting coating needs to be put on Micromed's new fever tablet. Each tablet without the coating has a mass of 400 mg. Experiments have shown that the coating cannot make up more than 1/35 of the mass of each tablet (otherwise some of the tablet processing machinery doesn't work right). So what is the maximum mass of the coating allowed on a 400-mg tablet? Round your answer to the nearest hundredth.

3.   One-fifth of a kilogram of experimental glue was made by Superchem, Inc. The glue was one-tenth acrylate X101, one-fifth wood glue, and the rest was made up of their regular type-A paper glue. How many kilograms of type-A paper glue were used in this mixture?

4.   * This is a pre-made sheet.
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5.   A 500-gram package of growth powder made by Z-Globe contains 0.09% yeast extract by mass. What fraction of the powder is not yeast extract?

6.   If a solution of MgCl is 2/9 M, what will its concentration be if it is diluted by 18%? Express your answer as a fraction.


 


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