7th Grade Math Review: Ratios and Proportions

Elisa solved 40 arithmetic problems in 2.5 minutes. Which of the following best represents her unit rate?

• 2.5 problems per minute

• 8 problems per minute

• 16 problems per minute

• 40 problems per minute

Norshaura has a recipe that requires 3/4 teaspoons of butter for every 2 cups of milk. If Norshaura uses 3 cups of milk, how many teaspoons of butter are needed?

• 1 1/8 teaspoons

• 1/2 teaspoons

• 1 3/8 teaspoons

• 7/8 teaspoons

The ratio of dogs to cats at the animal shelter is 4:1. If there are a total of 85 dogs and cats at the shelter, how many dogs are at the shelter?

• 17 dogs

• 51 dogs

• 68 dogs

• 72 dogs

You are traveling down the interstate averaging 50 mph. How much time has passed when you have traveled 120 miles?

• 60 minutes

• 6.2 hours

• 2.4 hours

• 25 minutes

You are riding your fifteen-speed bike and are averaging 35 mph to your friend's house. She lives 21 miles away. How many minutes will it take you to get to her house?

• 35 minutes

• 60 minutes

• 36 minutes

• 21 minutes

Which rate is NOT equivalent to the others?

• 4 for $1.00

• 6 for $1.50

• 10 for $2.00

• 12 for $3.00

Three pounds of apples cost $4.68. How many pounds of apples can you buy for $14.04?

• 9 lbs

• 8 lbs

• 12 lbs

• 7.5 lbs

Mrs. Watson wants to purchase some apples. She compared prices from several different online grocers. Which grocer's price table is based on a constant unit price?

• Groceries 2 U

• The Dotted Grocer

• The Market

• Web Grocer

The price of peaches at Ethan's supermarket can be determined by the equation p=0.28n, where P is the price and n is the number of pounds of peaches. What is the constant of proportionality?

• $0.56/2 pounds

• $1/pound

• $0.28/pound

• $1.50/3 pounds

• There is no constant of proportionality because the price of peaches is not directly proportional to the weight of the peaches.

Which table shows a proportional relationship between x and y?

• A

• B

• C

• D