Ratio Equations

SELECT THE EQUATION THAT WILL SOLVE FOR TEACHERS

In a bag of marbles, the ratio of red marbles to blue marbles is 3:5. If there are 24 blue marbles, how many red marbles are there?

• 20

• 15

• 10

• 30

The ratio of boys to girls in a class is 2:3. If there are 20 girls, how many boys are there?

• The number of boys = 20 - 3 = 17

• The number of boys = 3/2 * 20 = 30

• The number of boys = 2 * 20 = 40

• The number of boys = (2/3) * 20 = 40/3 = 13.33 (approx. 13 boys)

A fruit basket contains apples and oranges in the ratio 5:3. If there are 40 oranges, how many apples are there?

• 75

• 20

• 30

• 50

The ratio of the length to the width of a rectangle is 3:2. If the width is 6 cm, what is the length?

• 5 cm

• 15 cm

• 9 cm

• 12 cm

In a mixture of salt and sugar, the ratio of salt to sugar is 1:3. If there are 24 grams of sugar, how much salt is there?

• 8 grams

• 16 grams

• 12 grams

• 20 grams

The ratio of the number of pencils to pens in a box is 4:7. If there are 28 pens, how many pencils are there?

• 10

• 25

• 20

• 16

A car travels 180 miles in 3 hours. What is the ratio of the distance to the time taken?

• 60 miles per hour

• 120 miles per hour

• 30 miles per hour

• 90 miles per hour

The ratio of the number of boys to girls in a school is 5:4. If there are 180 girls, how many boys are there?

• 225

• 100

• 120

• 150

Simplify the ratio of
35 : 14

• 5 : 2

• 2 : 5

• 3 : 1

• 35: 14