New SAT Math Workbook

C 1 ft 4 in 16 in 1 yd 36 in 16 4 36 9 exercise

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: yd. = 36 in. 16 4 = 36 9 Exercise 2 1. (D) We compare books with cents. D dollars is equivalent to 100D cents. 3 8 = 100 D x 3x = 800 D 800 D x= 3 2. (D) The team won 25 games and lost 15. 25 5 = 15 3 3. (B) ac = Cross multiply. Divide by a. bd 2. (B) We compare inches to miles. 1 1 2 2= 4 10 x 1 1 x = 22 2 2 x = 45 ad = bc d= 4. bc a Cross multiply. Multiply by 2. (E) 32(x + 1) = 28(8) 32x + 32 = 224 32x = 192 x=6 (A) 9(y – 1) = 2y(3) 9y – 9 = 6y 3y = 9 y=3 3. (C) We compare cents to miles. 8 x = 5 115 5 x = 920 x = $1.84 5. Cross multiply. 4. (D) We compare gallons to miles. 20 x = 425 1000 425 x = 20, 000 17 x = 800 x = 47 1 17 Cross multiply. To avoid large numbers, divide by 25. 5. (A) We compare planes to passengers. rx = pm px = rm rm x= p Cross multiply. Divide by p. www.petersons.com 66 Chapter 4 Exercise 3 1. (B) Number of machines times hours needed remains constant. 8·6=5·x 48 = 5x x=9 2. 3 5 Exercise 4 1. (A) The more chickens, the fewer days. This is inverse. 30 · 4 = 40 · x 40x = 120 x=3 2. (A) The more cases, the more cents. This is direct. We compare cents with cans. In p cases there will be 12p cans. c x = 1 12 p x = 12cp (C) Number of children times days remains constant. 90 · 4 = 80 · x 80x = 360 1 x=4 2 3. (B) Diameter times speed remains constant. 15 · 200 = x · 150 3000 = 150x x = 20 3. (C) The fewer boys, the more days. This is inverse. m ⋅ d = (m – 2) ⋅ x md =x m–2 4. (E) Weight times distance from fulcrum remains constant. 80 · x = 60 · 8 80x = 480 x=6 4. (E) The less butter, the less sugar. This is direct. Change 12 10 = 18 x 12 x = 180 x = 15 3 lb. to 12 oz. 4 5. (A) Number of teeth times speed remains constant. 20 · 200 = x · 250 250x = 4000 x = 16 5. (B) The more kilometers, the more miles. This is direct. 3 x = 1.8 100 1.8 x = 300 18 x = 3000 2 x = 166 3 www.petersons.com Variation 67 Retest 1. (B) 3x(12) = 8(x + 7) 36x = 8x + 56 28x = 56 x=2 (D) 2 10 Cross multiply. = x 15 30 = 10 x x=3 6. (A) The more boys, the fewer...
View Full Document

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.

Ask a homework question - tutors are online