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

It is currently 12 Dec 2018, 20:24

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
Events & Promotions in December
PrevNext
SuMoTuWeThFrSa
2526272829301
2345678
9101112131415
16171819202122
23242526272829
303112345
Open Detailed Calendar
  • The winning strategy for 700+ on the GMAT

     December 13, 2018

     December 13, 2018

     08:00 AM PST

     09:00 AM PST

    What people who reach the high 700's do differently? We're going to share insights, tips and strategies from data we collected on over 50,000 students who used examPAL.
  • GMATbuster's Weekly GMAT Quant Quiz, Tomorrow, Saturday at 9 AM PST

     December 14, 2018

     December 14, 2018

     09:00 AM PST

     10:00 AM PST

    10 Questions will be posted on the forum and we will post a reply in this Topic with a link to each question. There are prizes for the winners.

Tom’s Mom is five times as old as him. In 6 years, Tom’s Mom will be

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

Hide Tags

Math Revolution GMAT Instructor
User avatar
V
Joined: 16 Aug 2015
Posts: 6625
GMAT 1: 760 Q51 V42
GPA: 3.82
Premium Member
Tom’s Mom is five times as old as him. In 6 years, Tom’s Mom will be  [#permalink]

Show Tags

New post 03 Oct 2018, 01:27
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

72% (00:58) correct 28% (01:37) wrong based on 47 sessions

HideShow timer Statistics

[Math Revolution GMAT math practice question]

Tom’s Mom is five times as old as him. In 6 years, Tom’s Mom will be three times as old as him. How old is Tom now?

A. 3
B. 4
C. 5
D. 6
E. 7

_________________

MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy.
"Only $99 for 3 month Online Course"
"Free Resources-30 day online access & Diagnostic Test"
"Unlimited Access to over 120 free video lessons - try it yourself"

Senior Manager
Senior Manager
User avatar
P
Joined: 18 Jul 2018
Posts: 494
Location: India
Concentration: Finance, Marketing
WE: Engineering (Energy and Utilities)
Premium Member Reviews Badge CAT Tests
Tom’s Mom is five times as old as him. In 6 years, Tom’s Mom will be  [#permalink]

Show Tags

New post 03 Oct 2018, 01:33
Mom = 5(Tom) or M = 5T

After 6 years,

M+6 = 3(T+6)

5T+6 = 3T+18

2T = 12

T= 6.

D is the answer.
_________________

When you want something, the whole universe conspires in helping you achieve it.

Intern
Intern
avatar
B
Joined: 09 Sep 2018
Posts: 1
Re: Tom’s Mom is five times as old as him. In 6 years, Tom’s Mom will be  [#permalink]

Show Tags

New post 03 Oct 2018, 02:30
1
It is a flawed question .. initially of Tom's age is 1 then his mum's age will be 5 ... Is this possible???

Posted from my mobile device
Senior Manager
Senior Manager
User avatar
P
Joined: 18 Jul 2018
Posts: 494
Location: India
Concentration: Finance, Marketing
WE: Engineering (Energy and Utilities)
Premium Member Reviews Badge CAT Tests
Tom’s Mom is five times as old as him. In 6 years, Tom’s Mom will be  [#permalink]

Show Tags

New post 03 Oct 2018, 02:34
1
Arnab1636 wrote:
It is a flawed question .. initially of Tom's age is 1 then his mum's age will be 5 ... Is this possible???

Posted from my mobile device



In the real world? I don't think so. But in maths, it's possible.
The question is correct.
_________________

When you want something, the whole universe conspires in helping you achieve it.

CEO
CEO
User avatar
D
Joined: 11 Sep 2015
Posts: 3235
Location: Canada
Re: Tom’s Mom is five times as old as him. In 6 years, Tom’s Mom will be  [#permalink]

Show Tags

New post 03 Oct 2018, 08:51
Top Contributor
MathRevolution wrote:
[Math Revolution GMAT math practice question]

Tom’s Mom is five times as old as him. In 6 years, Tom’s Mom will be three times as old as him. How old is Tom now?

A. 3
B. 4
C. 5
D. 6
E. 7


Tom’s Mom is five times as old as him.
Let T = Tom's PRESENT age
So, 5T = Mom's PRESENT age

This also means:
Let T + 6= Tom's age IN 6 YEARS
and 5T + 6 = Mom's age IN 6 YEARS

In 6 years, Tom’s Mom will be three times as old as Tom.
In other words: (Mom's age IN 6 YEARS) = 3(Tom's age IN 6 YEARS)
Or we can write: 5T + 6 = 3(T + 6)
Expand: 5T + 6 = 3T + 18
Subtract 3T from both sides: 2T + 6 = 18
So: 2T = 12
T = 6

Answer: D

RELATED VIDEO FROM OUR COURSE

_________________

Test confidently with gmatprepnow.com
Image

VP
VP
User avatar
D
Joined: 09 Mar 2016
Posts: 1215
Tom’s Mom is five times as old as him. In 6 years, Tom’s Mom will be  [#permalink]

Show Tags

New post 03 Oct 2018, 11:49
Tom` age x

Tom`s mom age 5x

in 6 years tom`s mom will be 3x

Tom`s mom age in 6 years = 5x+6

Toms age in 6 years will be three times less than his mom age; so, to make tom`s age equal to his mom`s age multiply tom`s age by 3. i.e 3(x+6)

hence we can equate Tom`s and his mom`s ages

5x+6=3(x+6)

5x+6=3x+18

2x = 12

x = 6
Math Revolution GMAT Instructor
User avatar
V
Joined: 16 Aug 2015
Posts: 6625
GMAT 1: 760 Q51 V42
GPA: 3.82
Premium Member
Re: Tom’s Mom is five times as old as him. In 6 years, Tom’s Mom will be  [#permalink]

Show Tags

New post 05 Oct 2018, 00:37
=>

We can set up this question using the IVY approach. “Is”
can be converted to “=” and “times” can be converted to the multiplication sign “x”.

Let m and t be Tom’s Mom’s age and Tom’s age now, respectively.
Then \(m = 5t\) since Tom’s mom is five times as old as Tom.
We also have
\(m + 6 = 3(t + 6)\) since Tom’s mom will be three times as old as Tom in 6 years.

Plugging \(m = 5t\) into the second equation yields
\(5t + 6 = 3t + 18\) or \(2t = 12.\)
So, \(t = 6\).

Therefore, the answer is D.
Answer: D
_________________

MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy.
"Only $99 for 3 month Online Course"
"Free Resources-30 day online access & Diagnostic Test"
"Unlimited Access to over 120 free video lessons - try it yourself"

GMAT Club Bot
Re: Tom’s Mom is five times as old as him. In 6 years, Tom’s Mom will be &nbs [#permalink] 05 Oct 2018, 00:37
Display posts from previous: Sort by

Tom’s Mom is five times as old as him. In 6 years, Tom’s Mom will be

  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®.