HSPT Math : HSPT Mathematics

Study concepts, example questions & explanations for HSPT Math

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Example Questions

Example Question #1971 : Hspt Mathematics

A metal cylindrical brick has a height of . The area of the top is .  A circular hole with a radius of  is centered and drilled half-way down the brick. What is the volume of the resulting shape?

Possible Answers:

Correct answer:

Explanation:

To find the final volume, we will need to subtract the volume of the hole from the total initial volume of the cylinder.

The volume of a cylinder is given by the product of the base area times the height: .

Find the initial volume using the given base area and height.

Next, find the volume of the hole that was drilled. The base area of this cylinder can be calculated from the radius of the hole. Remember that the height of the hole is only half the height of the block.

Finally, subtract the volume of the hole from the total initial volume.

Example Question #14 : How To Find The Volume Of A Cylinder

What is the volume of a cylinder with a diameter of 13 inches and a height of 27.5 inches?

Possible Answers:

 

Correct answer:

Explanation:

The equation for the volume of a cylinder is V = Ah, where A is the area of the base and h is the height.

Thus, the volume can also be expressed as V = πr2h.

The diameter is 13 inches, so the radius is 13/2 = 6.5 inches.

Now we can easily calculate the volume:

V = 6.52π * 27.5 = 1161.88π in3

Example Question #21 : Cylinders

Two cylinders are full of milk.  The first cylinder is 9” tall and has a base diameter of 3”.  The second cylinder is 9” tall and has a base diameter of 4”.  If you are going to pour both cylinders of milk into a single cylinder with a base diameter of 6”, how tall must that cylinder be for the milk to fill it to the top?

Possible Answers:

5"

9"

12"

6.25"

30"

Correct answer:

6.25"

Explanation:

Volume of cylinder = π * (base radius)2 x height = π * (base diameter / 2 )2 x height

Volume Cylinder 1 = π * (3 / 2 )2 x 9 = π * (1.5 )2 x 9 =  π * 20.25

Volume Cylinder 2 = π * (4 / 2 )2 x 9 = π * (2 )2 x 9 =  π * 36

Total Volume =  π * 20.25 + π * 36

Volume of Cylinder 3 = π * (6 / 2 )2 x H = π * (3 )2 x H = π * 9 x H

Set Total Volume equal to the Volume of Cylinder 3 and solve for H

π * 20.25 + π * 36 = π * 9 x H

20.25 + 36 = 9 x H

H = (20.25 + 36) / 9 = 6.25”

Example Question #1 : How To Find The Volume Of A Cube

A cubic box has sides of length x. Another cubic box has sides of length 4x. How many of the boxes with length x could fit in one of the larger boxes with side length 4x?

Possible Answers:

80

16

40

4

64

Correct answer:

64

Explanation:

The volume of a cubic box is given by (side length)3. Thus, the volume of the larger box is (4x)3 = 64x3, while the volume of the smaller box is x3. Divide the volume of the larger box by that of the smaller box, (64x3)/(x3) = 64.

Example Question #1972 : Hspt Mathematics

I have a hollow cube with 3” sides suspended inside a larger cube of 9” sides.  If I fill the larger cube with water and the hollow cube remains empty yet suspended inside, what volume of water was used to fill the larger cube?

Possible Answers:

702 in3

73 in3

72 in3

698 in3

216 in3

Correct answer:

702 in3

Explanation:

Determine the volume of both cubes and then subtract the smaller from the larger.  The large cube volume is 9” * 9” * 9” = 729 in3 and the small cube is 3” * 3” * 3” = 27 in3.  The difference is 702 in3.

Example Question #3 : Cubes

A cube weighs 5 pounds. How much will a different cube of the same material weigh if the sides are 3 times as long?

Possible Answers:

15 pounds

45 pounds

135 pounds

10 pounds

Correct answer:

135 pounds

Explanation:

A cube that has three times as long sides is 3x3x3=27 times bigger than the original. Therefore, the answer is 5x27= 135.

Example Question #1 : Cubes

If the volume of a cube is 50 cubic feet, what is the volume when the sides double in length?

Possible Answers:

500 cu ft

300 cu ft

100 cu ft

400 cu ft

200 cu ft

Correct answer:

400 cu ft

Explanation:

Using S as the side length in the original cube, the original is s*s*s. Doubling one side and tripling the other gives 2s*2s*2s for a new volume formula for 8s*s*s, showing that the new volume is 8x greater than the original.

Example Question #2 : How To Find The Volume Of A Cube

A cube has 2 faces painted red and the remaining faces painted green. The total area of the green faces is 36 square inches. What is the volume of the cube in cubic inches?

Possible Answers:

8

64

16

27

54

Correct answer:

27

Explanation:

Cubes have 6 faces. If 2 are red, then 4 must be green. We are told that the total area of the green faces is 36 square inches, so we divide the total area of the green faces by the number of green faces (which is 4) to get the area of each green face: 36/4 = 9 square inches. Since each of the 6 faces of a cube have the same size, we know that each edge of the cube is √9 = 3 inches. Therefore the volume of the cube is 3 in x 3 in x 3 in = 27 cubic inches.

Example Question #1 : How To Find The Volume Of A Cube

If a waterproof box is 50cm in length, 20cm in depth, and 30cm in height, how much water will overflow if 35 liters of water are poured into the box?

Possible Answers:

15 liters

1 liters

30 lites

5 liters

No water will flow out of the box

Correct answer:

5 liters

Explanation:

The volume of the box is 50 * 20 * 30 cm = 30,000 cm3.

1cm3 = 1mL, 30,000 cm3 = 30,000mL = 30 L.

Because the volume of the box is only 30 L, 5 L of the 35 L will not fit into the box.

Example Question #31 : Cubes

Kim from Idaho can only stack bales of hay in her barn for 3 hours before she needs a break. She stacks the bales at a rate of 2 bales per minute, 3 bales high with 5 bales in a single row. How many full rows will she have at the end of her stacking?

Possible Answers:

15

27

24

20

16

Correct answer:

24

Explanation:

She will stack 360 bales in 3 hours. One row requires 15 bales. 360 divided by 15 is 24. 

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