Introduction to ratios | Ratios, proportions, units, and rates | Pre-Algebra | Khan Academy

What is the main purpose of a ratio?

• To add numbers together

• To compare two or more quantities

• To subtract numbers from each other

• To find the total sum of items

If you have 10 horses and 5 dogs, which of these correctly shows the ratio of horses to dogs?

• 10 + 5

• 10 - 5

• 10:5

• 10 x 5

What is the simplest form of the ratio 10 horses to 5 dogs?

• 10:5

• 5:10

• 2:1

• 1:2

You have 20 apples, 40 oranges, and 60 strawberries. What is the simplified ratio of apples to oranges to strawberries?

• 2:4:6

• 1:2:3

• 20:40:60

• 3:2:1

A classroom has a ratio of boys to girls of 2:3. If there are 40 students in total, how many girls are there?

• 16

• 20

• 24

• 30

In a classroom, the ratio of boys to girls is 2:3. If there are 40 students in total, how many boys are there?

• 16

• 20

• 24

• 30

The ratio of sheep to chickens to pigs on a farm is 2:5:10. How many animals are there in one complete ratio group?

• 12

• 15

• 17

• 20

On a farm, the ratio of sheep to chickens to pigs is 2:5:10. If there are 51 animals in total, how many chickens are there?

• 10

• 15

• 20

• 25