Probability and Proportions: A 7th Grade Challenge

A bag contains 5 red marbles and 3 blue marbles. What is the probability of randomly selecting a red marble?

• 3/8

• 5/8

• 2/5

• 1/2

In a class of 30 students, 12 are girls. What is the proportion of girls to the total number of students?

• 1/3

• 3/7

• 4/5

• 2/5

A spinner is divided into 4 equal sections: 1/4 is red, 1/4 is blue, and 1/2 is green. What is the probability of landing on blue?

• 1/2

• 1/4

• 1/3

• 3/4

If 60% of a group of 50 people prefer chocolate ice cream, how many people prefer chocolate?

• 40

• 25

• 20

• 30

A recipe calls for 2 cups of flour for every 3 cups of sugar. What is the ratio of flour to sugar?

• 1:2

• 3:2

• 4:5

• 2:3

In a survey, 15 out of 50 students said they like math. What is the probability that a randomly selected student likes math?

• 0.2

• 0.3

• 0.4

• 0.5

A school has 200 students, and 80 of them are boys. What is the proportion of boys to girls in the school?

• 4:1

• 2:3

• 1:4

• 3:2

If a die is rolled, what is the probability of rolling an even number?

• 2/5

• 3/4

• 1/2

• 1/3

In a fruit basket, there are 10 apples and 5 oranges. What is the probability of picking an apple?

• 4/7

• 3/5

• 1/2

• 2/3

A car travels 150 miles on 5 gallons of gas. What is the proportion of miles traveled per gallon?

• 25 miles per gallon

• 30 miles per gallon

• 35 miles per gallon

• 40 miles per gallon