Grade 8 Mixture Problems Worksheet
This worksheet covers various mixture problems for 8th-grade algebra students, including solutions, alloys, and dry mixtures.
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Grade 8 Mixture Problems
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Read each problem carefully and solve for the unknown quantity. Show all your work.
1. A chemist has two solutions. One is 50% acid and the other is 75% acid. How much of each should be used to make 100 mL of a 60% acid solution?
2. An alloy is made by mixing two metals. One alloy is 40% copper and another is 70% copper. To make 30 kg of an alloy that is 50% copper, you need kg of the 40% copper alloy and kg of the 70% copper alloy.
3. A store sells two types of coffee. One costs $8 per pound and the other costs $12 per pound. How many pounds of the $8 coffee should be mixed with 10 pounds of the $12 coffee to make a mixture that sells for $10 per pound?
5 pounds
10 pounds
15 pounds
20 pounds
4. When mixing two solutions of different concentrations, the final concentration will always be between the two initial concentrations.
True
False
5. A candy store mixes almonds costing $9 per pound with peanuts costing $4 per pound. If 20 pounds of the mixture sells for $6 per pound, how many pounds of each nut were used?