Direct Variation Problems

Trina's paycheck earnings varies directly as the number of hours she works. If she works 19 hours and earns $187.15, what should she earn if she worked 40 hours?

• $394

• $443.25

• $472.80

• $512.20

The gas pressure in a chamber varies directly with the temperature in the chamber. If the pressure in the chamber is 150 atmospheres (atm) when the chamber is at 50 degrees, what is the pressure in the chamber when the temperature of the chamber is 75 degrees?

• 175 atm

• 200 atm

• 225 atm

• 275 atm

On a treasure map, the actual distance is directly related to the scaled distance.  If 15 miles is represented by 3 centimeters, then how many centimeters on the treasure map are equivalent to 135 miles?

• 27 cm

• 675 cm

• 529 cm

• 32 cm

Tags

CCSS.8.EE.B.5

The number of soft pretzels processed by a machine in a bakery is directly proportional to the
number of minutes that the machine runs. The machine can process 600 pretzels in 10 minutes of
continuous running. How many pretzels would the machine process in 52 minutes of continuous
running?

• 1,200

• 1,500

• 3,120

• 5,200

A person’s weekly pay is directly proportional to the number of hours worked. Shawn’s pay is $123.00 for 20 hours of work. Find the amount of pay for 31 hours of work.

• $3813

• $190.65

• $4.96

• $620

The number of kilograms of water in a person’s body varies directly as the person’s mass. A person with a mass of 90 kg contains 60 kg of water. How many kilograms of water are in a person whose mass is 75 kg?

• 50 kg water

• 72 kg water

• 150 kg water

• 94 kg water

The interest received on a savings account varies directly with the amount deposited. Daniel received $55.35 in interest on $1230 he deposited. How much interest would Daniel have received if he had deposited $2000 into his account?

• 44,444.44

• 90.00

• 1,285.35

• 34.04

If car covers 102 km in 6.8 litres of petrol, how much distance will it cover in 24.2 litres of petrol?

• 363

• 330

• 375

• 396

Tags

CCSS.HSF-LE.A.1B

In a direct variation, y = 39 when x = 3. 
Find the value of y when x = 2.

• 26

• 3

• 58.5

• 2

In a direct variation, y=39 when x=3.  Find the value of y when x=2.

• 26

• 3

• 58.5

• 2