g5 math review

The average of 5 numbers is 8. If four of the numbers are 6, 9, 7, and 5, what is the missing number?

• 7

• 9

• 10

• 12

The average of three numbers is 16. If two of the numbers are 12 and 22, what is the third number?

• 18

• 20

• 22

• 24

A class of 30 students took a test. The average score was 85. If the scores of 29 students are added up, the total is 2480. What is the score of the last student?

• 90

• 85

• 70

• 80

A student scored the following on five math tests: 90, 85, 80, 95, and 100. What is the average score?

• 90

• 91

• 92

• 93

Tom has 3 friends: Jack, Lily, and Emma. Jack is 10 years old, Lily is 12 years old, and Emma is 14 years old. Tom's age is unknown, but the average age of all four friends is 12 years. How old is Tom?

• 11

• 12

• 13

• 14

A teacher wants to find the average number of books read by 4 students during the summer. The students read 12, 14, 10, and 18 books, respectively. How many books did the class read on average?

• 18

• 16

• 14.5

• 13.5

A train travels 450 miles in 5 hours. If the train continues at the same rate, how many miles will it travel in 8 hours?

• 650

• 720

• 800

• 850

A runner completes 5 laps in 25 minutes. How many laps does the runner complete in 1 minute?

• 1

• 2

• 0.2

• 0.25

A swimming pool is being filled at a rate of 200 liters per hour. If it takes 12 hours to fill the pool, how many liters of water are in the pool after 8 hours?

• 1200 liters

• 1400 liters

• 1600 liters

• 1800 liters

A factory produces 4,500 toys in 9 days. If the factory operates for 8 hours each day, how many toys does the factory produce per hour?

• 50

• 55

• 60

• 65