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English 15 Public

Ratios and Proportions

Study Slideshow

If there are 1,200 calories in 8 oz of hot fudge. how many calories are in 3 oz of hot fudge?

450 calories

Is this a proportional relationship? If so, find the constant of proportionality and write an equation.

Yes, the constant of proportionality is 0.4. y=0.4x

n/13 = 4/1

n = 52

2 ⅘ + (-6.25)

-3 9/20 or -3.45

Is this a proportional relationship? If so, find the constant of proportionality and write an equation.

Yes, the constant of proportionality is 7. y=7x

10/4 = n/6

n = 15

Sparky's Car Wash can wash 20 service vehicles in 5 hours. How long would it take the company to wash 45 service vehicles?

11 hours and 15 minutes 11.25 or 11 1/4 hours

Is this a proportional relationship? If so, find the constant of proportionality and write an equation.

No, the ratios are not equivalent. 3 does not equal 2.5

If one gallon of paint covers 825 sq. ft., how much paint is needed to cover 2640 sq. ft.?

3.2 gallons

Bob is taking his son to look at a college 150 miles from their home. In the first hour they drive at a rate of 60 mph. If they want to reach their destination in 2 ½ hours, what speed must they average the last 1 1/2 hours?

60 miles per hour

A cookie reclpefor 60 cookies callsfor 4 cups of flour. HOW much flour isneeded to make 90 cookies?

6 cups

The ratio of orange juice to pineapple juice in TropicaI Treat punch is 4 to 3. Bill has 64 oz of orange juice How 10 much pineapple juice does he need?

48 oz

The Lawn Order lawnmower factory can produce 12 lawnmowers in 8 hours. How many hours will it take the factory to produce 30 lawnmowers?

20 hours

The Jelly Junior High school color is made by mixing red paint with yellow paint. The ratio of red to yellow is 3 to 5. How much red paint should be mixed with 20 oz of yellow?

12 oz