Math Proportional Relationships

In the 7th grade, there are 3 boys for every 5 girls. If there are 70 girls in the 7th grade, how many boys are there?

• 42 boys

• 30 boys

• 80 boys

• 28 boys

How many pages per hour did Johnny read?

• 276

• 14

• 70

• 60

Samantha earned $90 for working six hours at a blueberry farm. What was Samantha's rate in dollars per hour?

• $15 per hour

• $20 per hour

• $12 per hour

• $30 per hour

At a bake sale, you can buy 3 cookies for $2.00. What would be the cost of 15 cookies?

• $10

• $12

• $5

• $6

If two quantities are inversely proportional and one quantity doubles, what happens to the other quantity?

• It doubles

• It halves

• It remains the same

• It quadruples

The total distance a snail travels in feet, y, is directly proportional to the number of minutes

the snail travels, x.

• 2 feet per minute

• 0.5 foot per minute

• 3 feet per minute

• 0.3 foot per minute

The height, h, of a model built with toy blocks is proportional to the number of blocks, n, that are used. The table below shows this relationship. Which of the following is the missing value in the table?

• 28

• 38

• 35

• 45

If the ratio of boys to girls in a class is 3:4, how many boys are there if there are 20 girls?

• 15

• 25

• 10

• 30

If a scale drawing has a scale of 1 cm : 2 m, how long is the actual distance for a drawing length of 7 cm?

• 14 m

• 7 m

• 21 m

• 28 m

What is the constant of proportionality?

• $3

• $4

• $2

• $9