New SAT Math Workbook

Find his average rate for the entire trip solution 6

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Unformatted text preview: al, average rate can always be found by dividing the total distance covered by the total time spent traveling. Exercise 3 Work out each problem. Circle the letter that appears before your answer. 1. In a certain gym class, 6 girls weigh 120 pounds each, 8 girls weigh 125 pounds each, and 10 girls weigh 116 pounds each. What is the average weight of these girls? (A) 120 (B) 118 (C) 121 (D) 122 (E) 119 In driving from San Francisco to Los Angeles, Arthur drove for three hours at 60 miles per hour and for 4 hours at 55 miles per hour. What was his average rate, in miles per hour, for the entire trip? (A) 57.5 (B) 56.9 (C) 57.1 (D) 58.2 (E) 57.8 In the Linwood School, five teachers earn $15,000 per year, three teachers earn $17,000 per year, and one teacher earns $18,000 per year. Find the average yearly salary of these teachers. (A) $16,667 (B) $16,000 (C) $17,000 (D) $16,448 (E) $16,025 4. During the first four weeks of summer vacation, Danny worked at a camp earning $50 per week. During the remaining six weeks of vacation, he worked as a stock boy earning $100 per week. What was his average weekly wage for the summer? (A) $80 (B) $75 (C) $87.50 (D) $83.33 (E) $82 If M students each received a grade of P on a physics test and N students each received a grade of Q, what was the average grade for this group of students? (A) (B) (C) (D) (E) P+Q M+N PQ M+N MP + NQ M+N MP + NQ P+Q M+N P+Q 2. 5. 3. Averages 109 RETEST Work out each problem. Circle the letter that appears before your answer. 1. Find the average of the first 14 positive odd integers. (A) 7.5 (B) 13 (C) 14 (D) 15 (E) 14.5 What is the average of 2x - 3, x + 1, and 3x + 8? (A) 6x + 6 (B) 2x - 2 (C) 2x + 4 (D) 2x + 2 (E) 2x - 4 Find the average of (A) (B) (C) (D) (E) 4. 2 3 1 , 25%, and .09. 5 6. 2. The students of South High spent a day on the street collecting money to help cure birth defects. In counting up the collections, they found that 10 cans contained $5.00 each, 14 cans contained $6.50 each, and 6 cans contained $7.80 each...
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