• examPAL
    Most awarded test prep in the world
    Now free for 30 days

    Available with Beat the GMAT members only code

    MORE DETAILS
    examPAL
  • Veritas Prep
    Free Veritas GMAT Class
    Experience Lesson 1 Live Free

    Available with Beat the GMAT members only code

    MORE DETAILS
    Veritas Prep
  • Varsity Tutors
    Award-winning private GMAT tutoring
    Register now and save up to $200

    Available with Beat the GMAT members only code

    MORE DETAILS
    Varsity Tutors
  • Kaplan Test Prep
    Free Practice Test & Review
    How would you score if you took the GMAT

    Available with Beat the GMAT members only code

    MORE DETAILS
    Kaplan Test Prep
  • e-gmat Exclusive Offer
    Get 300+ Practice Questions
    25 Video lessons and 6 Webinars for FREE

    Available with Beat the GMAT members only code

    MORE DETAILS
    e-gmat Exclusive Offer
  • Magoosh
    Magoosh
    Study with Magoosh GMAT prep

    Available with Beat the GMAT members only code

    MORE DETAILS
    Magoosh
  • Economist Test Prep
    Free Trial & Practice Exam
    BEAT THE GMAT EXCLUSIVE

    Available with Beat the GMAT members only code

    MORE DETAILS
    Economist Test Prep
  • PrepScholar GMAT
    5 Day FREE Trial
    Study Smarter, Not Harder

    Available with Beat the GMAT members only code

    MORE DETAILS
    PrepScholar GMAT
  • EMPOWERgmat Slider
    1 Hour Free
    BEAT THE GMAT EXCLUSIVE

    Available with Beat the GMAT members only code

    MORE DETAILS
    EMPOWERgmat Slider
  • Target Test Prep
    5-Day Free Trial
    5-day free, full-access trial TTP Quant

    Available with Beat the GMAT members only code

    MORE DETAILS
    Target Test Prep

Difficult GMAT Math Problems

This topic has 2 expert replies and 32 member replies
Goto page Next

GMAT/MBA Expert

Difficult GMAT Math Problems

Post Sat Apr 15, 2006 2:34 pm
Here's a document with over 100 really tough GMAT math problems. If you can get through these easily, you probably don't need to prep much more for the math section.
Attachments

This post contains an attachment. You must be logged in to download/view this file. Please login or register as a user.



Last edited by beatthegmat on Wed Oct 03, 2007 8:06 pm; edited 1 time in total

  • +1 Upvote Post
  • Quote
  • Flag
heathermilne Newbie | Next Rank: 10 Posts Default Avatar
Joined
14 Sep 2008
Posted:
4 messages
Upvotes:
1
Post Sat Sep 20, 2008 6:35 am
Here's another version of the same problem set, this one with the answers hidden. Print it out, solve the problems, then select all the text (CTRL+A) and turn it back to black to reveal the answers.
Attachments

This post contains an attachment. You must be logged in to download/view this file. Please login or register as a user.

  • +1 Upvote Post
  • Quote
  • Flag
wilderness Master | Next Rank: 500 Posts Default Avatar
Joined
15 Mar 2008
Posted:
102 messages
Upvotes:
4
Post Fri Jul 18, 2008 5:54 am
Dear GMAT Gurus,

I am taking an average of 5 minutes to solve these tough questions. I know the average time we have on GMAT is 2, but I dont expect to have many questions of this difficulty in the exam. While working with OG, my average time is less than 2 min. So the question is

What have been your averge time when you do these questions and do you think average of 5 min per question is acceptable.

  • +1 Upvote Post
  • Quote
  • Flag
isisalaska Community Manager Default Avatar
Joined
10 Dec 2006
Posted:
363 messages
Followed by:
2 members
Upvotes:
7
Post Wed Dec 13, 2006 3:43 pm
are these problems more diffcult than the ones we will find in the GMAT test? are these problems more in line iwth the Kaplan 800 book?
Thanks!

_________________
Isis Alaska

  • +1 Upvote Post
  • Quote
  • Flag

GMAT/MBA Expert

Post Wed Dec 13, 2006 10:43 pm
isisalaska wrote:
are these problems more diffcult than the ones we will find in the GMAT test? are these problems more in line iwth the Kaplan 800 book?
Thanks!
These problems are overall more difficult than the ones you would encounter on the GMAT (in line with Kaplan 800). They aren't as well written as real GMAT questions, but still good practice.

  • +1 Upvote Post
  • Quote
  • Flag
Kansonne Junior | Next Rank: 30 Posts Default Avatar
Joined
24 Jan 2007
Posted:
21 messages
Post Mon Feb 05, 2007 9:02 pm
Hi,

Can anyone explain the solution to the first problem in this "gmat MATH tough problems.doc" set?

Here's the problem and solution again:

1. The sum of the even numbers between 1 and n is 79*80, where n is an odd number, then n=?
Sol: First term a=2, common difference d=2 since even number

therefore sum to first n numbers of Arithmetic progression would be

n/2(2a+(n-1)d)

= n/2(2*2+(n-1)*2)=n(n+1) and this is equal to 79*80

therefore n=79 which is odd...

My questions are...

I tried plugging and chugging different values of n into the equation above, for example, n = 3. The sum of even numbers between 1 and 3 is 2, but with the formula in the solution, I get 12. What am I doing wrong?

Thanks!

  • +1 Upvote Post
  • Quote
  • Flag

GMAT/MBA Expert

Post Mon Feb 05, 2007 9:07 pm
For your reference, here's the discussion thread for this problem: http://www.beatthegmat.com/viewtopic.php?t=406

Best of luck!

  • +1 Upvote Post
  • Quote
  • Flag
art Newbie | Next Rank: 10 Posts Default Avatar
Joined
24 Oct 2007
Posted:
1 messages
Post Wed Oct 24, 2007 11:21 am
n is the number of terms in the A.P.

For even numbers between 1 and 3 (which is 2), n is 1 and not 3
Plug this into the formula

  • +1 Upvote Post
  • Quote
  • Flag
ginger Newbie | Next Rank: 10 Posts Default Avatar
Joined
20 Feb 2008
Posted:
2 messages
Target GMAT Score:
700
Post Wed Feb 20, 2008 1:56 pm
Can someone please email me the file with the difficult questions? It is not opening at all and I cannot open or save it. Thanks alot!

meermaidrose@yahoo.com Smile

  • +1 Upvote Post
  • Quote
  • Flag
workhard_1978 Newbie | Next Rank: 10 Posts Default Avatar
Joined
27 Feb 2008
Posted:
9 messages
Post Thu Feb 28, 2008 2:33 am
Eric,

Where have these questions come from ?Kaplan,Princeton, Manhattan or OG

?

Pls let me know

  • +1 Upvote Post
  • Quote
  • Flag
jbeurg Newbie | Next Rank: 10 Posts Default Avatar
Joined
25 May 2008
Posted:
1 messages
Upvotes:
1
Test Date:
June 26
Target GMAT Score:
85
Post Mon May 26, 2008 4:22 am
beatthegmat wrote:
Here's a document with over 100 really tough GMAT math problems. If you can get through these easily, you probably don't need to prep much more for the math section.
Hi. I think there is an error in your document gmat MATH tough problems.doc. in #1, n=159, not 79. That is, 159=2n+1 is odd, using your n=79.

Jbeurg[/quote]

  • +1 Upvote Post
  • Quote
  • Flag
agoyal2 Senior | Next Rank: 100 Posts Default Avatar
Joined
29 Feb 2008
Posted:
59 messages
Upvotes:
4
Post Sat May 16, 2009 7:11 pm
I am looking for a solution to the below problem:

The price of a bushel of corn is currently $3.20, and the price of a peck of wheat is $5.80. The price of corn is increasing at a constant rate of 5x cents per day while the price of wheat is decreasing at a constant rate of root(2)*x-x cents per day. What is the approximate price when a bushel of corn costs the same amount as a peck of wheat?

Did not understand the solution presented in the document that well...

  • +1 Upvote Post
  • Quote
  • Flag
abhinav85 Master | Next Rank: 500 Posts Default Avatar
Joined
29 Dec 2008
Posted:
179 messages
Upvotes:
2
Test Date:
not decided
Target GMAT Score:
700
Post Mon May 18, 2009 1:31 pm
Can somebody help in downloading this file.

Its says .doc but i am unable to open it after downloading it???

  • +1 Upvote Post
  • Quote
  • Flag
NikolayZ Master | Next Rank: 500 Posts Default Avatar
Joined
18 Jun 2009
Posted:
124 messages
Upvotes:
35
Post Fri Jun 19, 2009 1:07 am
agoyal2 wrote:
I am looking for a solution to the below problem:

The price of a bushel of corn is currently $3.20, and the price of a peck of wheat is $5.80. The price of corn is increasing at a constant rate of 5x cents per day while the price of wheat is decreasing at a constant rate of root(2)*x-x cents per day. What is the approximate price when a bushel of corn costs the same amount as a peck of wheat?

Did not understand the solution presented in the document that well...
Hey mate.

Since you know the rate of both corn and wheat, you can assume that they will be equal through M days. And the differences in prices will be (rate*Mdays)

320 + (5x*Mdays) = 580 - (.41x*Mdays), then we can combine X and days into one variable.
I suppose you got what comes next =)

  • +1 Upvote Post
  • Quote
  • Flag
tohellandback Legendary Member Default Avatar
Joined
17 May 2009
Posted:
752 messages
Upvotes:
81
Target GMAT Score:
750
GMAT Score:
680
Post Sat Jun 20, 2009 10:12 pm
are you sure the answers are correct..I did the first problem and I think it is done wrong

1. The sum of the even numbers between 1 and n is 79*80, where n is an odd number, then n=?
Sol: First term a=2, common difference d=2 since even number

therefore sum to first n numbers of Arithmetic progression would be

n/2(2a+(n-1)d)

= n/2(2*2+(n-1)*2)=n(n+1) and this is equal to 79*80

therefore n=79 which is odd...
now the n here is the number of terms in the series 2,4,6..
the real n being asked in the question should be 79*2+1=159

_________________
The powers of two are bloody impolite!!

  • +1 Upvote Post
  • Quote
  • Flag

Best Conversation Starters

1 lheiannie07 108 topics
2 ardz24 68 topics
3 Roland2rule 65 topics
4 LUANDATO 53 topics
5 VJesus12 52 topics
See More Top Beat The GMAT Members...

Most Active Experts

1 image description GMATGuruNY

The Princeton Review Teacher

146 posts
2 image description Jeff@TargetTestPrep

Target Test Prep

119 posts
3 image description Rich.C@EMPOWERgma...

EMPOWERgmat

114 posts
4 image description Scott@TargetTestPrep

Target Test Prep

101 posts
5 image description EconomistGMATTutor

The Economist GMAT Tutor

85 posts
See More Top Beat The GMAT Experts