Proportionality and Interest Concepts

If 5 apples cost $10, how much do 15 apples cost?

• $20

• $30

• $25

• $15

A car travels 60 miles in 1 hour. How far will it travel in 3 hours?

• 120 miles

• 200 miles

• 150 miles

• 180 miles

If the time taken to complete a task is inversely proportional to the number of workers, how long will it take 4 workers to complete a task that takes 8 hours for 2 workers?

• 2 hours

• 10 hours

• 6 hours

• 4 hours

If 10 kg of rice costs $20, what is the cost of 25 kg of rice?

• $40.00

• $30.00

• $62.50

• $50.00

If the speed of a train is inversely proportional to the time taken, and it takes 4 hours to travel 200 miles, how long will it take to travel the same distance at double the speed?

• 5 hours

• 1 hour

• 2 hours

• 3 hours

A recipe requires 2 cups of flour for 4 servings. How much flour is needed for 10 servings?

• 6 cups

• 3 cups

• 5 cups

• 4 cups

If the number of hours worked is inversely proportional to the hourly wage, how does increasing the wage affect the hours worked if the total pay remains constant?

• Increasing the wage has no effect on hours worked.

• Increasing the wage increases the hours worked.

• Increasing the wage decreases the hours worked.

• Decreasing the wage decreases the hours worked.

If a car's fuel consumption is directly proportional to the distance traveled, how much fuel will it consume for 300 miles if it consumes 10 gallons for 150 miles?

• 25 gallons

• 15 gallons

• 30 gallons

• 20 gallons

A store is having a sale where all items are 20% off. If an item originally costs $50, what is the sale price?

• $40

• $30

• $45

• $25

If a population of bacteria doubles every hour, how many will there be after 3 hours if you start with 100 bacteria?

• 200

• 400

• 800

• 1600