testing header
Math Goodies is a free math help portal for students, teachers, and parents.
Free Math
Interactive Math Goodies Software

Buy Math Goodies Software
testing left nav
Math Goodies on facebook

Math Goodies Blog
Math Forums @ Math Goodies
Math Forums @ Math Goodies
Home | Profile | Register | Active Topics | Members | Search | FAQ
 All Forums
 Homework Help Forums
 Standardized Test Preparation Help
 help me average problem

Note: You must be registered in order to post a reply.
To register, click here. Registration is FREE!

Format Mode:
Format: BoldItalicizedUnderlineStrikethrough Align LeftCenteredAlign Right Horizontal Rule Insert HyperlinkInsert EmailInsert Image Insert CodeInsert QuoteInsert List Insert Special Characters Insert Smilie
* Forum Code is ON

Math Symbols
Squared [squared] Cubed [cubed] Square Root [sqrt] Cube Root [cbrt] Pi [pi]
Alpha [alpha] Beta [beta] Gamma [gamma] Theta [theta] Angle [angle]
Degrees [degrees] Times [times] Divide [divide] Less Than or Equal To [less-than] Greater Than or Equal To [greater-than]
Plus Minus [plus-minus] Integral [integral] Sum [sum] Sub 1 [sub-1] Sub 2 [sub-2]
Element Of [element-of] Union [union] Intersect [intersect] Subset [subset] Empty Set [empty-set]

  Check here to subscribe to this topic.

T O P I C    R E V I E W
sri340 Posted - 11/13/2008 : 07:41:13
Average age of A & B is 24 years and average of B, C & D is 22

years. The sum of the ages A, B, C & D is

a)90 years b) 96 years c)114 years d)data inadequate
6   L A T E S T    R E P L I E S    (Newest First)
Haven Posted - 11/14/2008 : 15:00:03
the_hill1962 Posted - 11/14/2008 : 12:49:44
I was thinking that "insufficient data" is the correct response.
The ONLY data given is two equations:
1. (A+B)/2 = 24
2. (B+C+D)/3 = 22
This means that [3(A+B) + 2(B+C+D)]/6 = 46.
That is 3A+5B+5C+2D=276, nothing more.

Subhotosh Khan Posted - 11/13/2008 : 18:15:47
the correct response to the problem is - insufficient data.
Haven Posted - 11/13/2008 : 18:04:02
I made an assumption based upon my understanding of the word "average" and the information given. If my assumption was incorrect, then I stand corrected and kindly give a better explanation.

Ultraglide Posted - 11/13/2008 : 12:53:54
How do you know B is 24 when you substituted it into B+C+D?
Haven Posted - 11/13/2008 : 11:37:28
To solve this problem you must have an understanding of what an average is and know how to use the average formula.

To solve this problem:

The first step is to find the value of A or B. The problem tells you that the average of A + B equals 24; by using the average formula this means that A + B divided by 2 equals 24, or multiplying both sides by 2 gives you A + B equals 48. the average value of A or B equals 24.

The second step is to substitute 24 into the second average problem of (B) + C + D = 22; this means that 24 + C + D divided by 3 equals 22, or multiplying both sides by 3 gives 24 + C + D = 66. Subtracting 24 from each side now gives the following C + D = 42

The third step is to take the values of A + B which equals 48, and C + D which equals 42 and add them together; 48 + 42 = 90

I hope this explanation was of some help to you.

Math Forums @ Math Goodies © 2000-2004 Snitz Communications Go To Top Of Page
This page was generated in 0.03 seconds. Snitz Forums 2000
testing footer
About Us | Contact Us | Advertise with Us | Facebook | Blog | Recommend This Page

Copyright © 1998-2015 Mrs. Glosser's Math Goodies. All Rights Reserved.

A Hotchalk/Glam Partner Site - Last Modified 25 Jan 2015