Ratios, Proportions, and Unit Rates

The brass section of a middle school jazz band has 4 trumpets and 3 trombones. What is the ratio of trombones to ALL the brass section members?

• 7/3, 7:3, 7 to 3

• 4/7, 4:7, 4 to 7

• 4/3, 4:3, 4 to 3

• 3/7, 3:7, 3 to 7

Jorge is using 12 brown tiles and 8 white tiles to design a section of an outdoor patio. Which ratio compares the number of brown tiles to the total number of tiles in one section?

• 12:8

• 8:12

• 12:20

• 8:20

The information below shows the party affiliation of the senators of the 109th congress. The ratio of Republicans to Democrats is 5:4. What is the missing number?

Republicans 55 Senators

Democrats ?

• 11

• 22

• 44

• 99

An animal shelter with only dogs and cats has a ratio of cats to dogs that is 9:7. What is the ratio of dogs to all animals?

• 7/9

• 7/16

• 9/7

• 9/16

An animal shelter has a ratio of pigs to dogs that is 6 to 5. If the shelter has 18 pigs, how many dogs does the shelter have?

• 12

• 13

• 14

• 15

The same number answers both question marks. What is the number?

x - 2, 4, ?

y - 3, ?, 9

• 6

• 8

• 12

• 4

Put < OR > OR = in the blank.

2:9 _____ 4:18

• <

• >

• =

Put < OR > OR = in the blank.

10:20 _____ 20:50

• <

• >

• =

In a classroom, the ratio of boys to girls is 4:5. If there are 20 boys, how many girls are there?

• 15

• 30

• 25

• 35

Put < OR > OR = in the blank.

6:12 _____ 3:6

• >

• <

• =