Constant Rate Word Problems

You are laying bricks for a patio. Every row has 20 bricks in it. Write a function that represents the number of bricks (y) you lay in x rows.

• y= x+20

• y=20

• y=20x

• 20 = x

The total cost (y) at an amusement park can be modeled by y=1.5x+20 where x is the number of rides you ride. What is the price to ride one ride?

• 1.5

• 21.5

• 0

• 20

Every minute 2.2 gal of water flows from a shower. A family of 5 showers for an average of 9 minutes per person every morning. How many gallons of water will the family use every morning?

• 39.6 gallons

• 3.96 gallons

• 99 gallons

• 9.9 gallons

Hamburger sells for 3 pounds for $6. If Alicia buys 10 pounds of hamburger, how much will she pay?

• $30

• $20

• $60

• $10

The distance that an automobile travels varies directly as the time it travels. If the car travels 280 miles in 7 hours, how far will it travel in 12 hours?

• 480

• 1960

• 84

• 25

Pizzas are $10 each plus a $2 delivery fee. Is the cost proportional to the number of pizzas ordered?

• Yes, unit rate is $10

• Yes, Unit rate is $12

• No, unit rate not constant

• No, because Little Caesars is $5

A bird flies 35 meters in 10 seconds.  If it keeps flying at the same rate, how long will it take it to fly 14 more meters?  

• x = 49 seconds

• x = 4 meters

• x = 49 meters

• x =  4 seconds

12 ounce shampoo bottle lasts Mike 16 weeks.  How long would you expect an 18-ounce bottle of the same brand to last him?

• 24 weeks

• 6 weeks

• 30 weeks

• 20 weeks

Sue types 3 pages in the same amount of time that Mary types 4.5 pages.  If Sue and Mary start typing at the same time, how many pages will Mary have typed when Sue has typed 11 pages?

• 16.5 pages

• 16 pages

• 15 pages

• 15.5 pages