Proportions

Set up the following proportion: Pens are 3 for $0.69 at the supply store. What proportion can be used to find p, the amount it will cost Mrs. Faber to buy 180 pens? 

• 3/0.69 = x/180

• 0.69/180 = x/3

• 3/0.69 = 180/x

Mike paid $21.00 before taxes for 5 DVDs. What is the constant of proportionality that relates the cost in dollars, y, to the number of DVDs, x?

• $105

• $16

• $26

• $4.20

Solve for the answer: Pens are 3 for $0.69 at the supply store. What proportion can be used to find p, the amount it will cost Mrs. Faber to buy 180 pens? 

• $782.61

• $41.04

• $0.01

• $78.26

Set up the following proportion: It cost Jericho and his 3 friends $20 to get into the skating rink. What proportion can be used to find c, the amount it will cost Jericho’s parents if they have Jericho’s birthday party at the skating rink and pay for Jericho and all 24 of his classmates? 

• 4/20 = 25/ x

• 20/25 = x/4

• x/25 = 4/20 

Solve the proportion: It cost Jericho and his 3 friends $20 to get into the skating rink. What proportion can be used to find c, the amount it will cost Jericho’s parents if they have Jericho’s birthday party at the skating rink and pay for Jericho and all 24 of his classmates? 

• $3.2

• $5

• $100

• $125

What is the constant rate of change for this proportion: It cost Jericho and his 3 friends $20 to get into the skating rink. What proportion can be used to find c, the amount it will cost Jericho’s parents if they have Jericho’s birthday party at the skating rink and pay for Jericho and all 24 of his classmates? 

• $4

• $5

• $6.25

• $1

Set up this proportion: Vito uses 9 liters of water to water 24 flower pots. He is wondering how many liters of water (w), it would take to water 40 flower pots. He assumes he'll use the same amount of water on each pot.

• 9/40 = x/24

• 9/24 = x/40

• 24/9 = x/40

Solve the following proportion: Vito uses 9 liters of water to water 24 flower pots. He is wondering how many liters of water (w), it would take to water 40 flower pots. He assumes he'll use the same amount of water on each pot.

• 15 liters

• 5.4 liters

• 106.7 liters

• 50 liters

What is the constant of proportionality: Eliana drove her car 81 km and used 9 liters of fuel. 

• 11 km/liter

• 5 km/liter

• 9 km/liter

• 3 km/liter

The table shows the prices for cases of soda at three supermarkets. Which supermarket offers the best price per can of soda? 

• Better Market

• Great Buys

• Good Food

• cannot be determined