GMAT Changed on April 16th - Read about the latest changes here

 It is currently 22 Apr 2018, 12:46

### 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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Roy is now 4 years older than Erik and half of that amount

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

### Hide Tags

Senior Manager
Status: Not afraid of failures, disappointments, and falls.
Joined: 20 Jan 2010
Posts: 283
Concentration: Technology, Entrepreneurship
WE: Operations (Telecommunications)
Roy is now 4 years older than Erik and half of that amount [#permalink]

### Show Tags

14 Feb 2010, 01:56
2
This post received
KUDOS
10
This post was
BOOKMARKED
00:00

Difficulty:

45% (medium)

Question Stats:

74% (02:39) correct 26% (02:55) wrong based on 305 sessions

### HideShow timer Statistics

Roy is now 4 years older than Erik and half of that amount older than Iris. If in 2 years, Roy will be twice as old as Erik, then in 2 years what would be Roy’s age multiplied by Iris’s age?

(a) 8
(b) 28
(c) 48
(d) 50
(e) 52
[Reveal] Spoiler: OA

_________________

"I choose to rise after every fall"
Target=770
http://challengemba.blogspot.com
Kudos??

Manager
Joined: 26 May 2005
Posts: 196
Re: Plzz! explain the answer [#permalink]

### Show Tags

14 Feb 2010, 02:28
r=e+4 -- 1st
4=i+2 .. 2nd

in 2 years
r+ 2 = 2 * (I+2) .. 3rd

solving 1st and 3rd equation we get r=6, i = 2, and using 2nd equation we get i=4

so in 2 years r=8 and i=6, product =48

C
Senior Manager
Status: Not afraid of failures, disappointments, and falls.
Joined: 20 Jan 2010
Posts: 283
Concentration: Technology, Entrepreneurship
WE: Operations (Telecommunications)
Re: Plzz! explain the answer [#permalink]

### Show Tags

14 Feb 2010, 11:40
Hmm! would you please! explain a bit how did u get 2nd & 3rd equations?
as if I take "If in 2 years, Roy will be twice as old as Erik" the n it means that
r+2=2e -- 2nd

and I didn't get these words "and half of that amount older than Iris" plzz! explain it.

Any help would be highly appreciated.
_________________

"I choose to rise after every fall"
Target=770
http://challengemba.blogspot.com
Kudos??

Math Expert
Joined: 02 Sep 2009
Posts: 44599
Re: Plzz! explain the answer [#permalink]

### Show Tags

14 Feb 2010, 15:03
4
This post received
KUDOS
Expert's post
4
This post was
BOOKMARKED
AtifS wrote:
Roy is now 4 years older than Erik and half of that amount older than Iris. If in 2 years, Roy will be twice as old as Erik, then in 2 years what would be Roy’s age multiplied by Iris’s age?

(a) 8
(b) 28
(c) 48
(d) 50
(e) 52

Hmm! would you please! explain a bit how did u get 2nd & 3rd equations?
as if I take "If in 2 years, Roy will be twice as old as Erik" the n it means that
r+2=2e -- 2nd

and I didn't get these words "and half of that amount older than Iris" plzz! explain it.

Any help would be highly appreciated.

Roy is now 4 years older than Erik --> $$R=E+4$$
Roy is now ... half of that amount older than Iris --> $$R=I+\frac{4}{2}=I+2$$ (half of the amount of 4)
In 2 years, Roy will be twice as old as Erik --> $$R+2=2(E+2)$$ (in 2 years for both Roy and Eric)

Then in 2 years what would be Roy’s age multiplied by Iris’s age --> $$(R+2)(I+2)=?$$

Solving: $$R=6$$ and $$I=4$$ --> $$(R+2)(I+2)=48$$

Answer: C.
_________________
Senior Manager
Status: Not afraid of failures, disappointments, and falls.
Joined: 20 Jan 2010
Posts: 283
Concentration: Technology, Entrepreneurship
WE: Operations (Telecommunications)
Re: Plzz! explain the answer [#permalink]

### Show Tags

15 Feb 2010, 07:20
Bunuel wrote:
AtifS wrote:
Hmm! would you please! explain a bit how did u get 2nd & 3rd equations?
as if I take "If in 2 years, Roy will be twice as old as Erik" the n it means that
r+2=2e -- 2nd

and I didn't get these words "and half of that amount older than Iris" plzz! explain it.

Any help would be highly appreciated.

Roy is now 4 years older than Erik --> $$R=E+4$$
Roy is now ... half of that amount older than Iris --> $$R=I+\frac{4}{2}=I+2$$ (half of the amount of 4)
In 2 years, Roy will be twice as old as Erik --> $$R+2=2(E+2)$$ (in 2 years for both Roy and Eric)

Then in 2 years what would be Roy’s age multiplied by Iris’s age --> $$(R+2)(I+2)=?$$

Solving: $$R=6$$ and $$I=4$$ --> $$(R+2)(I+2)=48$$

Thanks for explanation, Actually i couldn't get the equation with I otherwise I had solved other equations instead of this one

$$R=I+\frac{4}{2}=I+2$$ (half of the amount of 4)

looks like have to work on Word Problems.
thanks again and Kudos
couldn't get this part (half of the amount of 4)
_________________

"I choose to rise after every fall"
Target=770
http://challengemba.blogspot.com
Kudos??

SVP
Status: The Best Or Nothing
Joined: 27 Dec 2012
Posts: 1837
Location: India
Concentration: General Management, Technology
WE: Information Technology (Computer Software)
Re: Roy is now 4 years older than Erik and half of that amount [#permalink]

### Show Tags

11 Aug 2014, 03:18
5
This post received
KUDOS
Roy .............. Erik ............ Iris

x+4 ................ x .................. x+2 .................. Current Ages

(Roy 4 yrs older than Erik & 2 yrs older than Iris)

Ages after 2 yrs

x+6 ................ x+2 .................. x+4

x+6 = 2(x+2) ........ Roy is twice the age of Erik

x = 2

Roy * Iris = 8 * 6 = 48

Answer = C
_________________

Kindly press "+1 Kudos" to appreciate

Manager
Joined: 13 Feb 2011
Posts: 95
Re: Roy is now 4 years older than Erik and half of that amount [#permalink]

### Show Tags

20 Aug 2014, 13:16
I did this with back-solving and fortunately struck gold in the first attempt itself, i.e. testing with C.
Senior Manager
Joined: 20 Aug 2015
Posts: 393
Location: India
GMAT 1: 760 Q50 V44
Re: Roy is now 4 years older than Erik and half of that amount [#permalink]

### Show Tags

23 Nov 2015, 02:55
AtifS wrote:
Roy is now 4 years older than Erik and half of that amount older than Iris. If in 2 years, Roy will be twice as old as Erik, then in 2 years what would be Roy’s age multiplied by Iris’s age?

(a) 8
(b) 28
(c) 48
(d) 50
(e) 52

Since we have been given everything in terms of the of Erik, Let us assume the age of Erik to be E
And, the term " half of that amount" refers to the value 4.

Attachment:

Erik age.JPG [ 13.97 KiB | Viewed 9357 times ]

E + 6 = 2E + 4
E = 2
Therefore, (Roy's age)* (Iris's age) = 8*6 = 48 Option C
Intern
Joined: 02 Feb 2011
Posts: 39
Re: Roy is now 4 years older than Erik and half of that amount [#permalink]

### Show Tags

18 Feb 2016, 11:58
Folks

Please help me understand;

interpreted the Q stem incorrectly

Roy is now 4 years older than Erik and half of that amount older than Iris. If in 2 years, Roy will be twice as old as Erik, then in 2 years what would be Roy’s age multiplied by Iris’s age

'half of that amount' -- I interpreted as r= i+ 1/2(e+4)

How do i know half of that amount means - half of '4 years older'
Current Student
Status: DONE!
Joined: 05 Sep 2016
Posts: 398
Re: Roy is now 4 years older than Erik and half of that amount [#permalink]

### Show Tags

18 Oct 2016, 09:40
We can derive the following equations:

R=4+E --> (2 years later) --> R+2=2(E+2) solves to give E=2 & R=6 --> (2 years down the road) --> R = 8
R=2+I --> I = 4 -->(2 years later) --> I=6

6x8 = 48
Non-Human User
Joined: 09 Sep 2013
Posts: 6647
Re: Roy is now 4 years older than Erik and half of that amount [#permalink]

### Show Tags

15 Nov 2017, 12:32
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
Re: Roy is now 4 years older than Erik and half of that amount   [#permalink] 15 Nov 2017, 12:32
Display posts from previous: Sort by

# Roy is now 4 years older than Erik and half of that amount

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

 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®.