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326Chapter 5 Percent13. 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%