New SAT Math Workbook

New SAT Math Workbook

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Unformatted text preview: 0 120 450 The Stone family spends $500 per month for 4 rent. This is of their total monthly income. 15 Assuming that salaries remain constant, what is the Stone family income for one year? (A) (B) (C) (D) (E) $1875 $6000 $60,000 $22,500 $16,000 3. A resolution was passed by a ratio of 5:4. If 900 people voted for the resolution, how many voted against it? (A) 500 (B) 400 (C) 720 (D) 600 (E) 223 www.petersons.com 46 Chapter 3 4. SOLVING WITH LETTERS When problems use letters in place of numbers, the same principles discussed earlier apply. If you are not sure which operations to use, replace the letters with numbers to determine the steps needed in the solution. Example: It takes Mr. Cohen X days to paint his house. If he works for D days, what part of his house must still be painted? Solution: He has X - D days of painting left to do out of a total of X days; therefore, answer. Example: Sue buys 500 stamps. X of these are 10-cent stamps. of the remainder are 15-cent stamps. How 3 many 15-cent stamps does she buy? Solution: She buys 500 - X stamps that are not 10-cents stamps. buys Example: John spent $X on the latest hit record album. This represents of his weekly allowance. What is M his weekly allowance? Solution: Translate the sentence into an algebraic equation. Let A = weekly allowance X= 1 ·A M 1 (500 - X ) or 5003- X 15-cent stamps. 3 X-D is the correct X 1 1 of these are 15-cent stamps. Therefore, she 3 1 Multiply by M. MX = A www.petersons.com Verbal Problems Involving Fractions 47 Exercise 4 Work out each problem. Circle the letter that appears before your answer. 1. A class contains B boys and G girls. What part of the class is boys? (A) (B) (C) (D) (E) 2. B G G B B B+G B+G B B B-G 4. Mr. and Mrs. Feldman took t dollars in travelers checks with them on a trip. During the first week, they spent the second week, they spent end of the second week? (A) (B) (C) (D) (E) 4t 15 t 15 7t 15 11t 15 8t 15 1 of their money. During 5 1 3 of the remainder. How much did they have left at the M men agreed to rent a...
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This note was uploaded on 08/15/2010 for the course MATH a4d4 taught by Professor Colon during the Spring '10 term at Embry-Riddle FL/AZ.

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