Ratios, Rates and Proportional Relationships

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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 8 mL 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.

Which relationship is an example of a proportional function?

• rental company charges $80 per day and a one-time fee of $24

• taxi ride costs $2 for the first mile and $4 for each additional mile

• gym membership cost $30 per month and an additional annual registration fee of $75

• Beverly earns $210 a week for 4 weeks

A restaurant orders corn tortillas and flour tortillas. The ratio of the number of corn tortillas to the number of flour tortillas is 2 : 3. What is the ratio of the number of flour tortillas to the total number of tortillas?

• 3 : 8

• 3 : 5

• 2 : 8

• 2 : 5

Are the two ratios proportional?
7:12 and 5 to 8

• Yes

• No

What is k in this proportional relationship?

• 60 

• 120

• 1

• 180

Are the two ratios proportional?
12/14 and 30:35

• Yes

• No