Solving Proportional Relationships

If 5 oranges cost $2.50, what is the cost of 20 oranges?

• $5.00

• $7.50

• $10.00

• $12.50

A car travels 90 miles in 1.5 hours. What is its speed in miles per hour?

• 45 mph

• 60 mph

• 75 mph

• 90 mph

The ratio of red to blue marbles in a jar is 3:4. If there are 21 red marbles, how many blue marbles are there?

• 42

• 14

• 24

• 28

If 12 workers can build a wall in 8 days, how many days will it take 4 workers to build the same wall?

• 32 days

• 24 days

• 16 days

• 10 days

A recipe uses 2 cups of flour for every 3 cups of sugar. How many cups of sugar are needed for 8 cups of flour?

• 10 cups

• 12 cups

• 14 cups

• 15 cups

A machine produces 120 widgets in 4 hours. How many widgets will it produce in 10 hours?

• 240

• 300

• 360

• 400

The ratio of students to teachers in a school is 20:1. If there are 800 students, how many teachers are there?

• 40

• 50

• 60

• 70

A cyclist rides 18 miles in 2 hours. How far will they ride in 5 hours at the same rate?

• 40 miles

• 45 miles

• 50 miles

• 60 miles

If 3 pens cost $6, what is the cost of 15 pens?

• $15

• $20

• $30

• $25

A car uses 8 gallons of gas to drive 240 miles. How many miles can it drive with 12 gallons of gas?

• 320 miles

• 360 miles

• 400 miles

• 420 miles