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PSAT Math : How to find the volume of a cube

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Example Questions

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:

Correct answer:

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.

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Example Question #24 : Solid Geometry

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:

72 in³

702 in³

73 in³

216 in³

698 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.

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Example Question #25 : Solid Geometry

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:

10 pounds

15 pounds

135 pounds

45 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.

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Example Question #214 : Geometry

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

100 cu ft

400 cu ft

300 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.

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Example Question #215 : Geometry

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:

Correct answer:

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.

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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:

1 liters

30 lites

5 liters

15 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.

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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:

Correct answer:

Explanation:

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

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Example Question #1 : Cubes

A cube has a volume of $\dpi{100} \small 8 cm^{3}$ . What is the volume of cube with sides that are twice as long?

Possible Answers:

$\dpi{100} \small 2 cm^{3}$

$\dpi{100} \small 64 cm^{3}$

$\dpi{100} \small 16 cm^{3}$

$\dpi{100} \small 12 cm^{3}$

$\dpi{100} \small 27 cm^{3}$

Correct answer:

$\dpi{100} \small 64 cm^{3}$

Explanation:

The volume of a cube is $\dpi{100} \small s^{3}$ .

If each side of the cube is $\dpi{100} \small 2cm$ , then the volume will be $\dpi{100} \small 8cm^{3}$ .

If we double each side, then each side would be $\dpi{100} \small 4cm$ and the volume would be $\dpi{100} \small 64cm^{3}$ .

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Example Question #31 : Solid Geometry

How many smaller boxes with a dimensions of 1 by 5 by 5 can fit into cube shaped box with a surface area of 150?

Possible Answers:

Correct answer:

Explanation:

There surface are of a cube is 6 times the area of one face of the cube , therefore $6a^{2}=150$

$a^{2}=25$

$a=5$

a is equal to an edge of the cube

the volume of the cube is $a^{3}=5^{3}=125$

The problem states that the dimensions of the smaller boxes are 1 x 5 x 5, the volume of one of the smaller boxes is 25.

Therefore, 125/25 = 5 small boxes

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

If a cube has its edges increased by a factor of 5, what is the ratio of the new volume to the old volume?

Possible Answers:

25:1

100:1

15:1

5:1

125:1

Correct answer:

125:1

Explanation:

A cubic volume is side*side*side . Let the original sides be 1, so that the original volume is 1. Then find the volume if the sides measure 5. This new volume is 125. Therefore, the ratio of new volume to old volume is 125: 1.

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PSAT Math : How to find the volume of a cube

Study concepts, example questions & explanations for PSAT Math

All PSAT Math Resources

Example Questions

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

Example Question #24 : Solid Geometry

Example Question #25 : Solid Geometry

Example Question #214 : Geometry

Example Question #215 : Geometry

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

Example Question #31 : Cubes

Example Question #1 : Cubes

Example Question #31 : Solid Geometry

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

All PSAT Math Resources

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