Ratios, Proportions

A class has 30 students. 18 are boys. What is the ratio of boys to girls?

• 12:18

• 3:2

• 30:18

• 18:7

There are 80 students in Mr. Bass’ classes.  The ratio of boys to girls is 2 : 3.
How many boys are in the classes?
How many girls?

• Boys: 32
  Girls: 48

• Boys: 48
  Girls: 32

• Boys: 5
  Girls: 15

• Boys: 15
  Girls: 5

Solve for x

• x=1

• x=3

• x=3/5

• x=2

Solve for x

• x=6.5

• x=8

• x=4

• x=5.5

Solve the proportion:

• 4

• 8

• 14

• 10

Solve the proportion.

• k=5

• k=3.3333333

• k=60

• k=90

The ratio of pass to fail in PE class is 5:1.  If there are 90 students in PE, how many are passing?

• 75 students are passing

• 75 are failing

• 15 students are passing 

• 15 students are failing

Two numbers are in the ratio 7 : 9. If the sum of the numbers is 112, then the larger number is

• 49

• 72

• 63

• 42

A bag of marbles comes with 3 blue marbles, 2 red marbles, and 5 yellow marbles. What is the ratio of red to yellow?

• 2 to 5

• 5 to 3

• 3 to 5

• 5 to 2

Write the ratio of the first measurement to the second measurement.

Length of a classroom:  18 ft 4 in
Length of a closet:  48 in                  

• 55/12

• 12/55

• 9/2

• 2/9