DRHS Algebra - Ratio, Proportion, and Percent

Twenty stamps cost $8.40. How much does it cost to buy 5 stamps?

$2.10

What is 0.32% written as a decimal?

0.0032 0.32 / 100

What is 3/5 written as a decimal?

0.6 3 / 5 = 0.6

What is 82.4% written as a decimal?

0.824 82.4 / 100

Mary borrowed $11,000 at 5% interest for 4 years. What was the total interest?

11,000 * 0.05 * 4 = $2,200

What is the percent of decrease from 110 to 77?

110 - 77 = 33 divided by 110 = 0.3 * 100 = 30%

Keisha walked 12 miles in 3 hours. Which rate represents this situation?

12 miles/3 hours

Maria earned $126 in interest from her savings account. If she invested $450 for 7 years, what was the interest rate?

126 = 450 * r * 7 126 / 3,150 = 0.04 * 100 = 4% = r

What is 3.25% written as a fraction in lowest terms?

13/400

Forty-five is 30% of what number?

150

A pastry recipe calls for 3 cups of flour to make 8 servings. How many cups of flour are needed to make 6 servings?

2.25 cups

A bank paid 2.3% interest on a money market account. What is 2.3% written as a decimal?

2.3 / 100 0.023

A vase contains 12 tulips and 20 roses. What is the ratio of roses to the total number of flowers in the vase?

20 (Roses) to 32 (Roses + Tulips) 5 to 8

Lee had a total of 40 e-mails on Monday. Eight of the e-mails were from her friend Cara. What percent of the e-mails were from Cara?

20%

Juan deposited $200 in a savings account earning 3% interest over 2 years. What was the total amount of interest earned after 2 years?

200 * (convert 3% to a decimal) 0.03 * 2 = $12

What is 28% of 75?

21

The number of cars at a dealership dropped from 64 to 48 after a weekend sale. What is the percent of decrease in the number of cars?

25%

Suzanne deposited $2500 in a savings account earning 3.5% interest. What was the total interest earned after 6 years?

2500 * 0.035 * 6 = $525

To the nearest tenth of a percent, what is 3/11 written as a percent?

27.3%

Daniel read 3 books in 2.5 weeks. Which rate represents this situation?

3 books/2.5 weeks

Which ratio is NOT equivalent to 24/36?

3/4

Simon invested $1550 at 6.5% interest. He earned $302.25 interest after t years. What is the value of t?

302.25 = 1550 * 0.065 * t 302.25 / 100.75 3 years = t

The number of traffic violations in a city increased from 12 per month to 16 per month over the course of two years. What is the percent of increase in the number of traffic violations per month for that two-year period? Round to the nearest percent, if necessary.

33%

A plane travels 3300 miles in 6 hours. What unit rate describes the speed of the plane?

3300 divided by 6 550 miles per hour

The price of a suit decreased from $280 to $182 during a clearance sale. What is the percent of decrease in the price? Round to the nearest percent, if necessary.

35%

Twenty-two is what percent of 55?

40%

There are 48 ounces in 3 bottles. What unit rate represents this ratio?

48 divided by 3 16 ounces per bottle

What is 5.61 written as a percent?

561%

Which pair of ratios is proportional?

7/14 and 20/40

A printer prints 70 pages in 5 minutes. What unit rate represents this ratio?

70 divided by 5 14 pages per minute

A jar contains 11 pennies and 8 dimes.What is the ratio of dimes to pennies?

8 (Dimes) to 11 (Pennies)

What is 4/5 written as a percent?

80% 4/5 = 0.8 * 100

What is the percent of increase from 50 to 90?

90 - 50 = 40 divided by 50 = 0.8 * 100 = 80%

What is the ratio 15 : 75 in lowest terms?

GCF - 15 1 : 5

Which ratio is equivalent to 10 : 85?

GCF - 2 20/170

A survey showed that 62% of the people surveyed prefer a certain brand of toothpaste. What fraction of these people prefer the brand of toothpaste?

GCF - 2 62/100 31/50

What is the ratio 175/250 written in word form and in lowest terms?

GCF - 25 7 to 10

Which ratio is proportional to 3/5?

GCF - 4 12/20

What is 0.28 written as fraction in simplest form?

GCF - 4 28/100 28 / 4 = 7, 100 / 4 = 25 7/25

Which ratio is equivalent to 3 : 11?

GCF - 5 15 : 55

What is the ratio 16 to 40 written as a fraction in lowest terms?

GCF - 8 2/5

What is the solution to the proportion? 3/m = 12/15

m = 3.75 3 * 15 = 45 / 12 = 3.75

What is the solution to the proportion? n/18 = 5/9

n = 10 18*5 = 90 / 9 = 10

What is the solution to the proportion? 6/15 = x/20

x = 8 6 * 20 = 120 / 15 = 8

Ben bought a digital camera for $90. The tax rate is 6%. Which proportion can be used to find the amount of tax Ben will pay?

x/90 = 6/100