Examples of Ratio and Rates

A ratio is a

• comparison of two quantitities

• a comparison of two quantities with units

• a comparison of two quantities with units when the quantity in the denominator is 1

• the number in front of the variable in an expression or equation

Which of the following is NOT an example of a ratio?

• 3:1

• 3 and 1

• 3 to 1

• (3, 1)

What is the ratio of TRIANGLES TO SQUARES?

• 2:1

• 3:0

• 1:3

• 1:2

Two quantities are in the ratio 7:3. If the sum of the quantities is 100, what is the larger quantity?

• 70

• 75

• 30

• 25

If a car travels 60 miles in 1.5 hours, what is the ratio of miles to hours?

• 40:1

• 60:1.5

• 40:3

• 20:0.5

In Houston, Texas 6 birds ate 30 grams of worms in one night. At this rate, how many grams of worms could 98 birds eat in one night?

• 490

• 19.6

• 134

• 580

A 12-ounce bottle of shampoo lasts Enrique 16 weeks. How long would you expect an 18-ounce bottle of the same brand to last him? (no label)

A school's student to teacher ratio is 20:1. If there are 400 students, how many teachers are there?

• 20

• 25

• 15

• 10

A recipe calls for 2 cups of flour for every 3 cups of sugar. If you want to make a half batch, how many cups of flour do you need?

• 1

• 1.5

• 2

• 3

In a survey, the ratio of people who prefer tea to those who prefer coffee is 4:5. If 180 people were surveyed, how many prefer tea?

• 80

• 72

• 90

• 100