My Math Forum  

Go Back   My Math Forum > High School Math Forum > Algebra

Algebra Pre-Algebra and Basic Algebra Math Forum


Reply
 
LinkBack Thread Tools Display Modes
October 7th, 2012, 05:17 AM   #1
Member
 
Joined: Sep 2012
From: Norway

Posts: 35
Thanks: 0

How do I find out how much metal the container consists of?

Hello,

so I am stuck with a volume problem.

A closed container which is shaped like a rectangular prism has the following measurments;

Inside the container; 5,05 m x 2.45 m x 2.75 m
Outside; 5.10 m x 2.50 m x 2.80 m

Firstly, I had to find out how wide the walls of the container are and I did so by doing the following;

5/2 = 2.5 - I divided 5 by two because the the length and width on the inside of the container vs. length and width on the outside each equal 5 cm difference. I therefore divided it by two since we are talking about two sides. Know, I know I got the right answer, but is my way of thinking correct?


Secondly, I was asked to find how much metal the container is built of. I thought they are asking about the perimeter, but I guess I'm wrong since I worked out the perimeter for the outerside of the container and got 83.2 m^3. The correct answer is 1.7 m^3. Could someone help me understand what method I am supposed to use/what they are asking for in mathematical terms?
mathismydoom is offline  
 
October 7th, 2012, 07:19 AM   #2
Math Team
 
Joined: Dec 2006
From: Lexington, MA

Posts: 3,267
Thanks: 407

Re: How do I find out how much metal the container consists

Hello, mathismydoom!

Quote:
A closed container which is shaped like a rectangular prism has the following measurments;

Inside; 5,05 m x 2.45 m x 2.75 m
Outside; 5.10 m x 2.50 m x 2.80 m

Firstly . . . [snip]
[color=blue]This is correct![/color]

Secondly, I was asked to find how much metal the container is built of.
I thought they are asking about the perimeter, but I guess I'm wrong [color=beige] .[/color][color=blue]Perimeter?[/color]
since I worked out the perimeter for the outerside of the container and got 83.2 m^3.
[color=blue]A perimeter is not measured in cubic meters.[/color]

The correct answer is 1.7 m^3.

You said you were stuck with a "volume problem".
So why aren't you working with volumes?






soroban is offline  
October 8th, 2012, 12:21 AM   #3
Member
 
Joined: Sep 2012
From: Norway

Posts: 35
Thanks: 0

Re: How do I find out how much metal the container consists

Quote:
Originally Posted by soroban
Hello, mathismydoom!

Quote:
A closed container which is shaped like a rectangular prism has the following measurments;

Inside; 5,05 m x 2.45 m x 2.75 m
Outside; 5.10 m x 2.50 m x 2.80 m

Firstly . . . [snip]
[color=blue]This is correct![/color]

Secondly, I was asked to find how much metal the container is built of.
I thought they are asking about the perimeter, but I guess I'm wrong [color=beige] .[/color][color=blue]Perimeter?[/color]
since I worked out the perimeter for the outerside of the container and got 83.2 m^3.
[color=blue]A perimeter is not measured in cubic meters.[/color]

The correct answer is 1.7 m^3.

You said you were stuck with a "volume problem".
So why aren't you working with volumes?






Thank you do mch for your reply! Much appreciated!

I just have one more question which is what is the explanation as to why I have to find the volume for the inner and outer space in order to find out how much metal it consists of?
mathismydoom is offline  
October 8th, 2012, 12:28 AM   #4
Senior Member
 
MarkFL's Avatar
 
Joined: Jul 2010
From: St. Augustine, FL., U.S.A.'s oldest city

Posts: 12,155
Thanks: 466

Math Focus: Calculus/ODEs
Re: How do I find out how much metal the container consists

The volume of the metal is the difference between the outer and inner volumes.
MarkFL is offline  
October 11th, 2012, 02:51 AM   #5
Member
 
Joined: Sep 2012
From: Norway

Posts: 35
Thanks: 0

Re: How do I find out how much metal the container consists

Quote:
Originally Posted by MarkFL
The volume of the metal is the difference between the outer and inner volumes.
Can I be a pain in the ass and ask you to formulate that in plain English? I worked out the surface of the container and of course I ended up with the wrong answer, but I don't understand why I'd have to use that method.
mathismydoom is offline  
October 11th, 2012, 03:27 AM   #6
Global Moderator
 
Joined: Dec 2006

Posts: 18,852
Thanks: 1570

For a closed container (that has an empty interior), its overall (or "outer") volume comprises the volume of the material the container is made of and the volume of the empty interior of the container (its "inner" volume).
skipjack is offline  
Reply

  My Math Forum > High School Math Forum > Algebra

Tags
consists, container, find, metal



Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
An electronics assembly consists of two independent sub syst r-soy Algebra 6 October 15th, 2013 12:02 AM
Find Sk and Find Kv ( i got example formula below) kingkos Algebra 5 November 24th, 2012 11:40 PM
I want to find the distance in algebra find it kevinman Algebra 8 March 8th, 2012 05:53 AM
Container Space Optimization c8h8r8i8s8 Algebra 1 March 1st, 2009 10:51 AM





Copyright © 2018 My Math Forum. All rights reserved.