HSPT Math : How to find the volume of a figure

Study concepts, example questions & explanations for HSPT Math

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Example Questions

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

What is the volume of a box with a length of 5, a height of 7, and a base of 16?

Possible Answers:

\displaystyle 28

\displaystyle 280

\displaystyle 132

\displaystyle 560

Correct answer:

\displaystyle 560

Explanation:

When searching for the volume of a box we are looking for the amount of the space enclosed by the box. To find this we must know the formula for the volume of a box which is \displaystyle Base*Height*Length=Volume\: of\: box

Using this formula we plug in the numbers for Base, Height, and Length to get \displaystyle 5*7*16=560

Multiply to arrive at the answer of \displaystyle 560.

Example Question #1 : How To Find The Area Of A Rectangle

Swimming_pool

The above depicts a rectangular swimming pool for an apartment. The pool is two meters deep everywhere. What is the volume of the pool in cubic meters?

Possible Answers:

\displaystyle 1,440\textrm{ m}^{3}

\displaystyle 876\textrm{ m}^{3}

\displaystyle 720 \textrm{ m}^{3}

The correct answer is not among the other choices.

\displaystyle 820\textrm{ m}^{3}

Correct answer:

\displaystyle 720 \textrm{ m}^{3}

Explanation:

The pool can be seen as a rectangular prism with dimensions 24 meters by 15 meters by 2 meters; its volume is the product of these dimensions, or

\displaystyle 24 \times 15 \times 2 = 720 cubic meters.

Example Question #151 : Geometry

A cheese seller has a 2 foot x 2 foot x 2 foot block of gouda and she wants to cut it into smaller gouda cubes that are 1.5 inches on a side. How many cubes can she cut?

Possible Answers:

\displaystyle 4096

\displaystyle 1024

\displaystyle 256

\displaystyle 2048

\displaystyle 512

Correct answer:

\displaystyle 4096

Explanation:

First we need to determine how many of the small cubes of gouda would fit along one dimension of the large cheese block. One edge of the large block is 24 inches, so 16 smaller cubes \displaystyle (24\div 1.5) would fit along the edge. Now we simply cube this one dimension to see how many cubes fit within the whole cube. \displaystyle 16^{3}=4096.

Example Question #152 : Geometry

An aquarium is shaped like a perfect cube; the area of each glass face is 1.44 square meters. If it is filled to the recommended 90% capacity, then, to the nearest hundred liters, how much water will it contain? 

Note: 1 cubic meter = 1,000 liters.

Possible Answers:

Correct answer:

Explanation:

A perfect cube has square faces; if a face has area 1.44 square meters, then each side of each face measures the square root of this, or 1.2 meters. The volume of the tank is the cube of this, or

\displaystyle 1.2^{3} = 1.728 cubic meters.

Its capacity in liters is \displaystyle 1.728 \times 1,000 = 1,728 liters.

90% of this is 

\displaystyle 1,728 \times 0.9 = 1,555.2 liters. 

This rounds to 1,600 liters, the correct response.

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

Chemicals to clean a swimming pool cost $0.24 per cubic foot of water. If a pool is 6 feet deep, 14 feet long and 8 feet wide, how much does it cost to clean the pool? Round to the nearest dollar.

 

Possible Answers:

\displaystyle \$161

\displaystyle \$184

\displaystyle \$150

\displaystyle \$672

\displaystyle \$202

Correct answer:

\displaystyle \$161

Explanation:

The volume of the pool can be determined by multiplying the length, width, and height together.  

\displaystyle V = 6 \times 8 \times 14 = 672 ft^{3}

Each cubit foot costs 24 cents, so:

\displaystyle 672ft^3\times \$0.24=\$161.28\approx \$161

Example Question #671 : Geometry

The density of gold is \displaystyle 16\ g/cm^3and the density of glass is \displaystyle 2\ g/cm^3.  You have a gold cube that is \displaystyle x\ cm in length on each side.  If you want to make a glass cube that is the same weight as the gold cube, how long must each side of the glass cube be?

Possible Answers:

\displaystyle 3x

\displaystyle 4x

\displaystyle 2x

\displaystyle 1.5x

\displaystyle 2.5x

Correct answer:

\displaystyle 2x

Explanation:

Weight = Density * Volume

Volume of Gold Cube = side3= x3

Weight of Gold = 16 g/cm3 * x3

Weight of Glass = 3/cm3  * side3

Set the weight of the gold equal to the weight of the glass and solve for the side length:

16* x3 = 2  * side3

side3 = 16/2* x3 =  8 x3

Take the cube root of both sides:

side = 2x

Example Question #3 : How To Find The Volume Of A Figure

What is the volume of a cylinder with a diameter of 6, and a height of 5?

Possible Answers:

\displaystyle 30\pi

\displaystyle 90\pi

\displaystyle 15\pi

\displaystyle 180\pi

\displaystyle 45\pi

Correct answer:

\displaystyle 45\pi

Explanation:

Write the formula to find the volume of a cylinder.

\displaystyle V=\pi r^2 h

The radius is half the diameter, which is 3.

Substitute all the known dimensions into the formula.

\displaystyle V=\pi( 3^2) (5)=45\pi

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

Find the volume of the cube if the face of square has a perimeter of .

Possible Answers:

Correct answer:

Explanation:

Find the side length of the square given the square perimeter. The perimeter of a square is:

\displaystyle P=4s

\displaystyle 4=4s

\displaystyle s=1

The side of the cube has a length of one.

Write the formula to find the volume of a cube.

\displaystyle V=s^3

Substitute the side length.

Example Question #4 : How To Find The Volume Of A Figure

Swimming_pool

One cubic meter is equal to one thousand liters.

The above depicts a rectangular swimming pool for an apartment. The pool is \displaystyle 2.5 meters deep everywhere. How many liters of water does the pool hold?

Possible Answers:

\displaystyle 1,950,000\textrm{ L}

\displaystyle 9,000,000\textrm{ L}

\displaystyle 90,000\textrm{ L}

\displaystyle 900,000\textrm{ L}

\displaystyle 195,000\textrm{ L}

Correct answer:

\displaystyle 900,000\textrm{ L}

Explanation:

The pool can be seen as a rectangular prism with dimensions \displaystyle 24 meters by \displaystyle 14 meters by \displaystyle 2.5 meters; its volume in cubic meters is the product of these dimensions, which is 

\displaystyle 24 \times 15 \times 2.5 = 900 cubic meter.

One cubic meter is equal to one thousand liters, so multiply:

\displaystyle 900 \times 1,000 = 900,000 liters of water.

Example Question #3 : How To Find The Volume Of A Figure

What is the volume of the rectangular prism below? 

Screen shot 2015 11 05 at 12.01.48 pm

 

Possible Answers:

\displaystyle 110cm^3

\displaystyle 90cm^3

\displaystyle 100cm^3

\displaystyle 47cm^3

\displaystyle 45cm^3

Correct answer:

\displaystyle 90cm^3

Explanation:

The formula for volume of a rectangular prism is \displaystyle \small v=l\times w\times h

\displaystyle \small v=90cm^3

Remember, volume is always labeled as units to the third power. 

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