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326Chapter 5 <strong>Percent</strong>13. Bachelors According to the U.S. Census Bureau data forthe number of marriages in 2004 approximately 31.2%of the 109,830,000 males age 15 years or older havenever been married. How many males age 15 years orolder have never been married?34,266,96014. Bachelorettes According to the U.S. Census Bureau datafor the number of marriages in 2004, approximately25.8% of the 117,677,000 females age 15 years or olderhave never been married. How many females age 15years or older have never been married?30,360,66615. Number of Students If 48% of the students in a certaincollege are female and there are 1,440 female students,what is the total number of students in thecollege?3,000 students16. Mixture Problem A solution of alcohol and water is 80%alcohol. The solution is found to contain 32 millilitersof alcohol. How many milliliters total (both alcohol andwater) are in the solution?40 mL17. Number of Graduates Suppose 60% of the graduatingclass in a certain high school goes on to college. If 240students from this graduating class are going on tocollege, how many students are there in the graduatingclass?400 students18. Defective Parts In a shipment of airplane parts, 3% areknown to be defective. If 15 parts are found to bedefective, how many parts are in the shipment?500 parts19. Number of Students There are 3,200 students at ourschool. If 52% of them are female, how many femalestudents are there at our school?1,664 female students20. Number of Students In a certain school, 75% of the studentsin first-year chemistry have had algebra. If thereare 300 students in first-year chemistry, how many ofthem have had algebra?225 students21. Population In a city of 32,000 people, there are 10,000people under 25 years of age. What percent of thepopulation is under 25 years of age?31.25%22. Number of Students If 45 people enrolled in a psychologycourse but only 35 completed it, what percent of the studentscompleted the course? (Round to the nearest tenthof a percent.)77.8%
5.3 Problem Set327Calculator ProblemsThe following problems are similar to Problems 1–22. They should be set up the same way. Then the actual calculationsshould be done on a calculator.23. Number of People Of 7,892 people attending an outdoorconcert in Los Angeles, 3,972 are over 18 years of age.What percent is this? (Round to the nearest wholenumberpercent.)50%24. Manufacturing A car manufacturer estimates that 25%of the new cars sold in one city have defective enginemounts. If 2,136 new cars are sold in that city, how manywill have defective engine mounts?534 cars25. Population The map shows the most populated citiesin the United States. If the population of New YorkCity is about 42% of the state’s population, what is theapproximate population of the state?About 19.2 million26. Prom The graph shows how much girls plan to spendon the prom. If 5,086 girls were surveyed, how manyare planning on spending less than $200 on the prom?Round to the nearest whole number.1,475 girlsWhere Is Everyone?The Cost of Looking GoodLos Angeles, CA3.80San Diego, CA 1.26Phoeniz, AZ 1.37Dallas, TX 1.21Houston, TX 2.01Chicago, IL2.89Philadelphia, PA 1.49New York City, NY* Polpulation in MillionsSource: U.S. Census Bureau8.08Less than $200$200 - $400$400 - $60019%More than $600 11%Takin’ out a loan 7%Source: www.thepromsite.com 5,086 total votes29%34%Multiply.Getting Ready for the Next Section27. 0.06(550)3328. 0.06(625)37.529. 0.03(289,500)8,68530. 0.03(115,900)3,477Divide. Write your answers as decimals.31. 5.44 ÷ 0.0413632. 4.35 ÷ 0.0314533. 19.80 ÷ 3960.0534. 11.82 ÷ 1970.0635. 1,836 _0.12 15,30036. 115 _0.1 1,15037. 90 _600 0.1538. 105 _750 0.14
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