Mastering Ratios and Proportions

If there are 4 red balls to every 5 blue balls in a bag, how many red balls are there if there are 20 blue balls?

• 16

• 20

• 25

• 32

A car travels 180 miles in 3 hours. What is the unit rate in miles per hour?

• 60 mph

• 90 mph

• 45 mph

• 30 mph

Convert 48 inches to feet.

• 3 feet

• 4 feet

• 5 feet

• 6 feet

If two quantities are proportional and the first quantity is 6 when the second quantity is 8, what is the first quantity when the second quantity is 4?

• 2

• 3

• 12

• 24

• 3

• 5

• 6

• 45

A recipe calls for 2 cups of flour for every 3 cups of sugar. If you want to use 10 cups of sugar, how many cups of flour do you need?

• 4 cups

• 6 cups

• 6.67 cups

• 7.5 cups

A cyclist travels 30 miles in 2 hours. What is the average speed of the cyclist in miles per hour?

• 10 mph

• 15 mph

• 20 mph

• 25 mph

If a map scale shows that 1 inch represents 50 miles, how many miles are represented by 7 inches on the map?

• 250 miles

• 300 miles

• 350 miles

• 400 miles

You have a rope that is 60 feet long. You need to cut it into pieces that are each 3 feet long. How many pieces of rope will you have?

• 15

• 20

• 25

• 30

A school has a student to teacher ratio of 20:1. If there are 480 students, how many teachers are there?

• 20

• 24

• 25

• 30