Ratio Basics
The ratio of pencils to erasers in a box is 4:7. If there are 12 pencils, how many erasers are there?
21 erasers.
Complete the table for the ratio 5:2.
5:2, 10:4, 15:6, :
20:8.
A printer makes 240 pages in 4 minutes. What is the unit rate?
60 pages per minute
40% of 90 is what number?
36
A movie lasts 135 minutes, with 27 minutes of previews. What is the ratio of previews to the whole movie?
27:135 or 1:5.
True or False: The ratios 9:12 and 6:8 are equivalent.
True.
On a coordinate plane, what point represents 12 red marbles out of 48 total?
(48, 12).
A bag of rice costs $7.20 for 12 pounds. What is the price per pound?
$0.60 per pound.
A student answered 18 questions, which was 60% of the test. How many total questions were there?
30 questions.
A train goes 90 minutes at 50 mph and 30 minutes at 80 mph. How far does it travel?
115 miles.
Write a ratio comparing 18 apples to 30 total pieces of fruit.
18:30 or 3:5 (apples to total).
A babysitter charges $24 for 3 hours. How much for 7 hours?
$56.
A car travels 315 miles on 9 gallons of gas. What is the unit rate in miles per gallon?
35 miles per gallon.
Liam scored 72% on his test and got 36 correct. How many total questions were there?
50 questions.
Emma has completed 45% of her 420-page novel. What page will she read next?
Page 190.
A library has 15 fiction books for every 35 nonfiction books. What is the ratio of fiction to total books?
15:50 or 3:10
The ratio of lions to tigers at a zoo is 2:9. If there are 77 tigers, how many lions are there?
17 lions.
Sarah types 2,160 words in 45 minutes. What is her typing speed in words per minute?
48 words per minute.
A jacket costs $80 and is marked down 25%. What is the sale price?
$60.
A swimming pool is 20 ft × 15 ft × 6 ft deep. How many cubic feet of water can it hold?
1,800 cubic feet.
A bag has red, blue, and green marbles in the ratio 2:3:5. If there are 50 marbles in total, how many are blue?
15 blue marbles.
A recipe uses 4 cups of flour for every 6 cups of sugar. If you only have 18 cups of sugar, how much flour should you use to keep the ratio the same?
12 cups of flour.
A cyclist travels 147 miles in 6 hours and 30 minutes. What is his average speed in miles per hour?
22.6 mph (approx).
A store first increases the price of a jacket by 20% and then discounts the new price by 25%. If the original price was $100, what is the final price?
$90.
A punch recipe calls for 2 cups of juice for every 5 cups of soda. If you want to make 49 cups of punch, how many cups of juice and how many cups of soda are needed?
14 cups of juice and 35 cups of soda.