Ratios and Proportional Reasoning

What is the constant rate of change between the quantities in the table?

• 4 calories per minute

• 15 calories per minute

• 40 calories per minute

• 60 calories per minute

The number of calories Kira burns while riding a bike varies directly with the number of hours the bike is ridden. How many calories are burned in 60 minutes?

• 60

• 2880

• 480

• 960

Shanda knits 5 scarves in 2 hours. Assuming the number of scarves she knits varies directly with time, how many scarves will she knit in 10 hours?

• 2

• 10

• 25

• 5

What is the ratio of red apples to green apples

• 7 apples to 3 green

• 4 red apples to 7 apples

• 4 red apples to 3 green apples

• 3 green apples to 4 red apples

Mrs. Shelly paid $3 for 6 muffins and Mrs. Kloske paid $9 for 18 muffins.

Do these relationships form equivalent ratios?

• yes, equivalent

• no, not equivalent

Which ratio is equivalent to 5 to 4?

• 25 to 20

• 10 to 12

• 4 to 5

• 15 to 8

In the fruit bowl there are 4 apples, 2 bananas, and 5 pears.

What is the ratio of pears to ALL fruit?

• 5:4

• 5:11

• 2:5

• 6:5

• 4
• 12

In an animal shelter, the ratio of dogs to cats is 4 to 3. If there are 72 dogs at the shelter, how many cats are there?

• 54 cats

• 18 cats

• 96 cats

• 16 cats

Solve for x 

• x = 1/10

• x = 10

• x = 4

• x = 5