6.4BD, 6.5A: Proportional Ratios & Rates

The ratio of the number of boys to the number of girls in a choir is 5 to 4. There are 60 girls in the choir.

How many boys are in the choir?

• 75

• 61

• 48

• 80

• $330

• $255.75

• $279

• $82.50

In Austin, Texas, 8 bats ate 40 grams of insects in one night. At this rate, how many grams of insects could 64 bats eat in one night?

• 20 days

• 12 days

• 100 days

• 36 days

A window washer cleaned 38 windows in 2 hours. At this rate, how many windows did he clean in 7 hours?

A county with an area of 425 Square miles has a population of 9,350 residents. Which rate best represents the relationship between the population of the country and the area of the county?

• 22 square miles per resident

• 9,350 residents per square mile

• 22 residents per square mile

• 425 square miles per resident

To make pink paint, Sylvia mixes 7 cups of white paint to every 3 cups of red paint. Which table shows possible values of w, the number of cups of white paint Sylvia uses, and r, the number of cups of red paint?

• 
• 
• 
• 

• 80

• 240

• 60

• 180

Megan and Desmond each added the same amount of water to their aquariums. Megan mixed 5 mL of a chemical solution with every gallon of water for her aquarium. Desmond mixed 8mL of the chemical solution with every 2 gallons of water for his aquarium.

Which of these statements is true?

• Megan used more solution per gallon of water than Desmond because 5:1 is greater than 8:2.

• Megan used more solution per gallon of water than Desmond because 5 mL is greater than 2 mL.

• Desmond used more solution per gallon of water than Megan because 8 mL is greater than 5 mL.

• Desmond used more solution per gallon of water than Megan because 8:2 is greater than 5:1