Ratios Rates and Percents

In a book of stickers, the ratio of large stickers to small stickers is 7 to 5. Based on this ratio, how many large stickers are in the book if there are a total of 96 stickers?

• 56

• 40

• 64

• Not here

The fire department responded to 48 emergencies last week. At 5 of every 20 locations the fire fighters were forced to cut through window bars to get inside. At how many locations did the fire fighters have to cut through window bars last week?

• 12

• 40

• 60

• 15

Rancher Rob shipped 520 head of cattle in 12 hours. At this rate, how many head of cattle did Rancher Rob ship in 3 hours?

• 130

• 2,080

• 65

• 43

Of the 620 students enrolled at Kendall Intermediate School, 30% are 6th grade students. What is the total number of 6^th grade students at Kendall Intermediate School?

• 434

• 207

• 186

• 200

What is 75% of 120?

• 60

• 75

• 90

• 100

What is 25% of 200?

• 25

• 50

• 75

• 100

If the ratio of pencils to pens in a box is 7:5, how many pens are there if there are 21 pencils?

• 15

• 18

• 12

• 14

Answer explanation

To find the number of pens, set up fractions as an equality like this: 7/5 =21/x. 7*3 is 21, so multiply the 5 by 3 as well to get the number of pens, 15.

If the ratio of red balls to blue balls in a bag is 5:3, how many blue balls are there if there are 20 red balls?

• 12

• 15

• 8

• 10

Answer explanation

If the ratio of red balls to blue balls is 5:3, and there are 20 red balls, set up an equality like this: 5/3 = 20/x. To get from 5 in the left numerator to 20 in the right numerator, multiply 5*4. Since the numerator is multiplied by 4, the denominator would also be multiplied by 4. 3*4 = 12.

If a graph shows that 25 students prefer reading and 15 students prefer writing, what is the ratio of students who prefer reading to those who prefer writing?

• 5:3

• 3:5

• 5:2

• 2:5

Juan has track practice every afternoon. On Monday he will run a total of 12 laps around the track. Each lap measures 400 meters. If Juan has run 2,880 meters so far, what percent of the total distance has he completed?

• 60%

• 40%

• 6%

• 4%