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...
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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 EmbryRiddle FL/AZ.
 Spring '10
 Colon
 SAT

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