Math Bee 8th Grade

Jay’s father is twice as old as Jay. In 20 years, Jay will be two-thirds as old as his father. How old is Jay now?

• 10

• 15

• 20

• 25

What is the velocity of a car (in miles per hour) if it goes 40 miles in 35 minutes?

• 80.57

• 68.57

• 65

• 80

A cube has a depth of 37 cm. What is the volume of the cube?

• 50,653

• 99,937

• 49,284

• 49,210

The perimeter of a rectangle is 70 ft. The width of the rectangle is 40% of the length. Find the length of the rectangle.

• 25

• 14

• 28

• 42

Charles has a rectangular flower garden that is 7 yd long and 12 yd wide. One bag of fertilizer can cover 6 square yard. How many bags will he need to buy to cover the entire garden?

• 14

• 6

• 10

• 9.333333333

Calculate the volume (in cubic centimeters) of a prism that is 5 m long, 40 cm wide and 2500 mm high.

• 500,000

• 500

• 5,000

• 50,000

A swimming pool is 8 m long, 6 m wide and 1.5 m deep. The water resistant paint needed for the pool costs $6 per square meter. How much will it cost to paint the interior surfaces of the pool?

• 540

• 72

• 432

• 129

An elevator went up 7 floors, then it went down 10 floors, thet it went down 5 floors, after that, it went up 14 floors, then it went down 16 floors, and finally it stopped on the 20th floor. In which floor did the elevator started?

• 24

• 30

• 34

• 27

In three more years, Miguel's grandfather will be six times as old as Miguel was last year. When Miguel's present age is added to his grandfather's present age, the total is 68. How old is Miguel now?

• 11

• 13

• 15

• 9

A rectangular fish tank 60 centimeters by 15 centimeters by 34 centimeters is 1/3 full of water. Find the volumen in cm3 of water needed to fill the tank completely.

• 20,400

• 10,200

• 30,600

• 40,800