Solving Part to Part Ratios

In a bag of marbles, the ratio of red marbles to blue marbles is 3:5. If there are 15 red marbles, how many blue marbles are there?

• 25

• 30

• 20

• 10

A recipe for pancakes requires a ratio of 2 cups of flour to 1 cup of milk. If you have 8 cups of flour, how many cups of milk do you need?

• 4

• 6

• 2

• 10

In a class, the ratio of boys to girls is 4:7. If there are 28 boys, how many girls are there?

• 49

• 56

• 35

• 42

A fruit salad recipe calls for a ratio of 3 apples to 4 oranges. If there are 9 apples, how many oranges are needed?

• 8

• 12

• 6

• 15

In a box of crayons, the ratio of red crayons to blue crayons is 2:3. If there are 10 red crayons, how many blue crayons are there?

• 5

• 15

• 20

• 25

A toy car set requires a ratio of 5 wheels to 1 car. If there are 20 wheels, how many cars are there?

• 4

• 5

• 10

• 3

In a zoo, the ratio of monkeys to lions is 6:1. If there are 12 monkeys, how many lions are there?

• 3

• 8

• 2

• 10

A school has a ratio of 3 teachers to 25 students. If there are 9 teachers, how many students are there?

• 100

• 75

• 50

• 30

In a bag of candies, the ratio of chocolate candies to gummy candies is 4:7. If there are 16 chocolate candies, how many gummy candies are there?

• 28

• 14

• 32

• 40

A garden has a ratio of 2 roses to 5 tulips. If there are 8 roses, how many tulips are there?

• 10

• 15

• 20

• 25