Ratio Proportion

The ratio of green houses to white houses on Winthrop Street is equal to 2 to 3. There are 60 white houses on Winthrop Street. How many green houses are there?

• 20

• 30

• 40

• 60

Kelly ate 3 apples. This represents 50% of the bag of apples. How many apples were originally in the bag?

• 3

• 4

• 5

• 6

The ratio of blue marbles to white marbles in Simran's bag is equal to 1 to 2. If there are 20 blue marbles in his bag, how many white marbles are there?

• 20

• 40

• 30

• 50

The ratio of boys to girls in Mr. Baker's social studies class is 2 to 3. If there are 30 total students in the class, how MANY MORE girls are in the class than boys?

• 6

• 8

• 10

• 12

If the ratio of boys to girls in a class is 5:6 and there are 30 girls, how many boys are there?

• 25

• 20

• 24

• 28

If the ratio of pencils to pens in a box is 7:5, how many pens are there if there are 21 pencils?

• 15

• 18

• 12

• 14

Answer explanation

To find the number of pens, set up fractions as an equality like this: 7/5 =21/x. 7*3 is 21, so multiply the 5 by 3 as well to get the number of pens, 15.

If the ratio of cats to dogs in a pet store is 3:4, and there are 12 cats, how many dogs are there?

• 16

• 14

• 18

• 20

What is the constant of proportionality (in miles per hour) based on the table?

• 45

• 90

• 135

• 2

If the ratio of cats to dogs is 3:4, how many cats are there if there are 20 dogs?

• 15 cats

• 25 cats

• 30 cats

• 10 cats

A recipe calls for 2 cups of flour for every 3 cups of sugar. If you use 9 cups of sugar, how many cups of flour do you need?

• 4

• 6

• 8

• 10