GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 21 Mar 2019, 13:04

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

The average age of A,B,C,D five years ago was 45 years. By including X

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 53771
The average age of A,B,C,D five years ago was 45 years. By including X  [#permalink]

Show Tags

New post 21 Feb 2019, 00:39
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

73% (01:26) correct 27% (02:34) wrong based on 15 sessions

HideShow timer Statistics

The average age of A,B,C,D five years ago was 45 years. By including X, the present average age of all the five is 49 years. The present age of X is :

A. 64 years
B. 48 years
C. 45 years
D. 40 years
E. 39 years

_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

VP
VP
User avatar
P
Joined: 31 Oct 2013
Posts: 1272
Concentration: Accounting, Finance
GPA: 3.68
WE: Analyst (Accounting)
Re: The average age of A,B,C,D five years ago was 45 years. By including X  [#permalink]

Show Tags

New post 21 Feb 2019, 02:18
Bunuel wrote:
The average age of A,B,C,D five years ago was 45 years. By including X, the present average age of all the five is 49 years. The present age of X is :

A. 64 years
B. 48 years
C. 45 years
D. 40 years
E. 39 years



Total age of A,B,C,D = (45 * 4 ) + 20 = 400

***** 20 must be added to the total age of A,B,C,D . 45 is basically the average of 5 years ago. In total 4*5 = 20 years gap to the current age of these guys.

Total age including X = 49 * 5 = 245

Difference = 245 - 200 = 45.

C is the correct answer.
SVP
SVP
User avatar
P
Joined: 18 Aug 2017
Posts: 2431
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
GMAT ToolKit User Premium Member CAT Tests
Re: The average age of A,B,C,D five years ago was 45 years. By including X  [#permalink]

Show Tags

New post 21 Feb 2019, 09:39
Bunuel wrote:
The average age of A,B,C,D five years ago was 45 years. By including X, the present average age of all the five is 49 years. The present age of X is :

A. 64 years
B. 48 years
C. 45 years
D. 40 years
E. 39 years



sum of age a,b,c,d = 45*4 ; 180
and 5 years added to each = 20 yrs ; actual age as of today ; 200
so 200+x= 49*5 ;
x = 45
IMO C
_________________

If you liked my solution then please give Kudos. Kudos encourage active discussions.

Target Test Prep Representative
User avatar
P
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
Posts: 5381
Location: United States (CA)
Re: The average age of A,B,C,D five years ago was 45 years. By including X  [#permalink]

Show Tags

New post 24 Feb 2019, 06:41
Bunuel wrote:
The average age of A,B,C,D five years ago was 45 years. By including X, the present average age of all the five is 49 years. The present age of X is :

A. 64 years
B. 48 years
C. 45 years
D. 40 years
E. 39 years


If the average age of A, B, C, D five years ago was 45 years, their average age now is 50 years. Therefore, the sum of their ages is 4 * 50 = 200. Adding the 5th age of X, we have:

(200 + X)/5 = 49

200 + X = 245

X = 45

Answer: C
_________________

Scott Woodbury-Stewart

Founder and CEO

Scott@TargetTestPrep.com
TTP - Target Test Prep Logo
122 Reviews

5-star rated online GMAT quant
self study course

See why Target Test Prep is the top rated GMAT quant course on GMAT Club. Read Our Reviews

GMAT Club Bot
Re: The average age of A,B,C,D five years ago was 45 years. By including X   [#permalink] 24 Feb 2019, 06:41
Display posts from previous: Sort by

The average age of A,B,C,D five years ago was 45 years. By including X

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


Copyright

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.