Mastering Ratios and Sample Sizes: A 7th Grade Challenge

A recipe calls for 2 cups of flour for every 3 cups of sugar. If you want to make a batch with 12 cups of sugar, how many cups of flour do you need?

• 4 cups of flour

• 10 cups of flour

• 8 cups of flour

• 6 cups of flour

In a survey, 4 out of 10 students prefer chocolate ice cream. If 50 students are surveyed, how many would you expect to prefer chocolate ice cream?

• 15

• 20

• 25

• 30

Tags

CCSS.7.RP.A.3

A school has a ratio of 5 teachers for every 20 students. If there are 100 students, how many teachers are needed to maintain the same ratio?

• 25 teachers

• 30 teachers

• 10 teachers

• 15 teachers

A bag contains red and blue marbles in a ratio of 3:2. If there are 30 marbles in total, how many are red?

• 18

• 15

• 12

• 24

In a class, the ratio of boys to girls is 3:5. If there are 40 students in total, how many boys are there?

• 25

• 10

• 20

• 15

A recipe requires 1 part vinegar to 4 parts oil. If you want to make 15 parts of the mixture, how much vinegar do you need?

• 4 parts vinegar

• 2 parts vinegar

• 3 parts vinegar

• 5 parts vinegar

In a poll, 6 out of 15 people prefer tea over coffee. If 90 people are polled, how many would you expect to prefer tea?

• 36

• 24

• 45

• 18

Tags

CCSS.7.RP.A.3

A fruit basket has apples and oranges in a ratio of 2:3. If there are 25 fruits in total, how many oranges are there?

• 20

• 5

• 10

• 15

A school wants to maintain a ratio of 1:4 for teachers to students. If there are 12 teachers, how many students can there be?

• 60

• 24

• 48

• 36

In a survey, 7 out of 20 people like to read books. If 200 people are surveyed, how many would you expect to like reading books?

• 50

• 70

• 90

• 30

Tags

CCSS.7.RP.A.3