Students are given 3 minutes to complete each multiple-choice question on a test and 8 minutes for each free-response question. There are 15 questions on the test and the students have been given 55 minutes to complete it. Test Time Number of Questions Time per Item (minutes) Total Time (minutes) Multiple Choice m 3 3 m Free Response 15 minus m 8 x Total 15 55 Which value could replace x in the table?
Fifteen percent of the pigment in paint color A is black. Sixty percent of the pigment in paint color B is black. An unknown amount of paint color B is mixed with 40 mL of paint color A, resulting in a paint that contains 25% black pigment. Which equation can be used to solve for x , the total amount of paint in the mixture of the two colors?
Milk and cream are mixed together for a recipe. The total volume of the mixture is 1 cup. If the milk contains 2 percent fat, the cream contains 18 percent fat, and the mixture contains 6 percent fat, how much cream is in the mixture?
Alex has 84 quarters and nickels worth a total of $17.80. Which equation can be used to find q , the number of quarters Alex has?
A chemist mixes 4 liters of one acid solution with 10 liters of a 40% solution, resulting in a 30% acid solution. The table shows the amount of each solution used. Acidity Liters Acid Concentration Total x percent Acid 4 x 40 percent Acid 10 0 point 4 0 4 Mixture 14 0 point 3 0 What is the value of x , the acid concentration of the first solution?
Brass is made from a mixture of copper and other elements. A mixture that is 80% copper is combined with a mixture that is 60% copper, resulting in 100 pounds of brass that is 65% copper. Which equation can be used to find x , the amount of 60 percent mixture used to create the 65 percent mixture?
The hardcover version of a book weighs 7 ounces while its paperback version weighs 5 ounces. Forty-five copies of the book weigh a total of 249 ounces. Weight of Books Number of Books Weight per book (ounces) Total Weight (ounces) Hard Cover h 7 7 h Paperback 45 minus h 5 x Total 45 249 Which value could replace x in the table?
Maki uses 20 gallons of a solution with an unknown ethanol concentration and 60 gallons of a 12% ethanol solution to make 80 gallons of a 10% solution. The table shows the amount of each solution. Ethanol Mixture Gallons Ethanol Concentration Total x percent Ethanol 20 x 12 percent Ethanol 60 0 point 1 2 7 point 2 Mixture 80 0 point 1 0 What is the value of x , the concentration of the unknown ethanol solution?
Giuliana has 22 quarters and dollar coins worth a total of $10.75. Which equation can be used to find d , the number of dollar coins Giuliana has?
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