:Q 1. A 5-quart solution of acid and water is 60% acid. If a gallon of water is added, what percent of the resulting solution is acid? (a) 66 2/3% (b) 33 1/3% (c) 50% (d) 60% (e) 40% :RCB :Q 2. A certain type of brass is made of 7 parts copper to 3 parts zinc. How many pounds of zinc will be needed to make 420 pounds of this brass alloy? (a) 294 lb. (b) 180 lb. (c) 168 lb. (d) 126 lb. (e) It cannot be determined from the information given. :RCD :Q 3. In a vat, there are 60 quarts of a solution that is 20% alcohol. How many quarts of pure alcohol must be added to this solution to produce a solution that is 40% alcohol? (a) 12 qt. (b) 20 qt. (c) 24 qt. (d) 120 qt. (e) 60 qt. :RCB :Q 4. A coin contains copper and nickel, the nickel being 25% of the alloy. How many pounds of alloy for minting the coins can be made from 60 pounds of copper? (a) 80 (b) 45 (c) 240 (d) 15 (e) 180 :RCA :Q 5. How many gallons of water must be added to 20 gallons of a 10% solution of acid to reduce it to an 8% solution? (a) 4 (b) 16 (c) 5 (d) 25 (e) It cannot be determined from the information given. :RCC :Q 6. How many ounces of water must be evaporated from 200 ounces of a 3% solution of salt to produce an 8% solution? (a) 75 oz. (b) 100 oz. (c) 150 oz. (d) 175 oz. (e) 125 oz. :RCE :Q 7. An automobile uses a solution of alcohol and water as an antifreeze. It now has 16 quarts of a solution which is 50% alcohol. If a gallon of pure alcohol is added, what percent of alcohol will the solution then contain? (a) 70 (b) 75 (c) 56 (d) 53 (e) 80 :RCA :Q 8. At the Kennedy High School play, a capacity crowd of 460 attended. Admission was .75 for students and $1.25 for others. If the total receipts were $485.00, how many students attended? (a) 92 (b) 180 (c) 280 (d) 200 (e) It cannot be determined from the information given. :RCB :ET :ET Copyright ARROW INSTRUCTIONAL SYSTEMS July 1983
