Direct or Inverse

1.The number of pencils sold varies directly as the cost. If 5 pencils cost $0.45, find the cost of 7 pencils.

• Direct Variation

• Inverse Variation

2.The amount of money spent at the gas station varies directly with the number of gallons purchased. When 9.5 gallons of gas were purchased the cost was $36.52. How much would 12 gallons of gas cost?

• Direct Variation

• Inverse Variation

3.The time needed to travel a certain distance varies inversely with the rate of speed. If it takes 6 hours to travel a certain distance at 40 miles per hour, how long will it take to travel the same distance at 55 miles per hour?

• Direct Variation

• Inverse Variation

4.The number of centimeters y in a linear measurement varies directly with the number of inches x in the measurement. Pablo's height is 167.64 centimeters or 66 inches. What is Maria's height in centimeters if she is 63 inches tall?

• Direct Variation

• Inverse Variation

5.Kendra earns $32.50 for working 7 hours. If the amount m she earns varies with h the number of hours she works, how much will she earn for working 12 hours?

• Direct Variation

• Inverse Variation

6.The time it takes to travel a fixed distance varies inversely with the speed traveled. If it takes Pancho 52 minutes to bike to his fishing spot at 9.5 miles per hour, how long will it take him if he rides at 11 miles per hour?

• Direct Variation

• Inverse Variation

7.On a scale drawing, 2 feet represents 30 yards. How many yards are represented by 3 feet?

• Direct Variation

• Inverse Variation

8.On a map, 180 miles are represented by 4 inches. How many miles are represented by 6 inches?

• Direct Variation

• Inverse Variation

9.The number of hours required to do a job varies inversely as the number of people working. It takes 8 hours for 4 people to paint the inside of a house. How long would it take 5 people to do the job?

• Direct Variation

• Inverse Variation

10.The length of the base of a triangle with constant area varies inversely as the height. When the base is 18 cm long, the height is 7 cm. Find the length of the base when the height is 6 cm.

• Direct Variation

• Inverse Variation