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# If the quantities change in opposite directions it is

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Unformatted text preview: e in opposite directions, it is inverse variation, solved by means of constant products. In the following exercises, decide carefully whether each is an example of direct or inverse variation. Exercise 4 Work out each problem. Circle the letter that appears before your answer. 1. A farmer has enough chicken feed to last 30 chickens for 4 days. If 10 more chickens are added, how many days will the feed last? (A) (B) (C) (D) (E) 2. 3 1 1 3 4. A recipe calls for lb. of butter and 18 oz. of 4 sugar. If only 10 oz. of butter are available, how many ounces of sugar should be used? (A) (B) (C) (D) (E) 13 23 24 14 15 1 2 3 12 2 3 1 5 3 2 5. At c cents per can, what is the cost of p cases of soda if there are 12 cans in a case? (A) 12cp (B) (C) (D) (E) cp 12 12 cp 12 p c 12c p If 3 kilometers are equal to 1.8 miles, how many kilometers are equal to 100 miles? (A) 60 (B) (C) (D) (E) 166 540 150 1 2 2 3 160.4 3. If m boys can put up a fence in d days, how many days will it take to put up the fence if two of the boys cannot participate? (A) (B) (C) (D) (E) d –2 d (m – 2) m md m–2 m–2 md m(m – 2) d www.petersons.com 62 Chapter 4 RETEST Work out each problem. Circle the letter that appears before your answer. 1. Solve for x: (A) (B) (C) (D) (E) 2. 2 4 7 28 3 3x x + 7 = 8 12 6. Ten boys agree to paint the gym in 5 days. If five more boys join in before the work begins, how many days should the painting take? (A) (B) 1 3 1 3 2 3 2 4 1 Solve for x if a = 5, b = 8, and c = 3: (A) 5 (B) 20 (C) 2 (D) 3 (E) 6 1 a−3 b+2 = x 5c (C) (D) (E) 7. 10 1 2 3 2 4 2 3. A map is drawn to a scale of inch = 20 2 miles. How many miles apart are two cities that 1 are 3 inches apart on the map? 4 A weight of 120 pounds is placed five feet from the fulcrum of a lever. How far from the fulcrum should a 100 pound weight be placed in order to balance the lever? (A) 6 ft. (B) (C) (D) (E) 1 6 1 5 2 1 6 2 2 6 3 (A) (B) (C) (D) (E) 4. 70 130 65 1 32 2 35 4 ft. ft. ft. ft. 7 inches by 8 Mr. Weiss earne...
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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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