Last visit was: 21 Apr 2026, 18:03 It is currently 21 Apr 2026, 18:03
Home
Messages
Tests
Schools
Events
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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel
Back to Forum
Create Topic
   1   2   3 
User avatar
kinjiGC
User avatar
Joined: 03 Feb 2013
Last visit: 12 Oct 2025
Posts: 789
Own Kudos:
2,736
Given Kudos: 567
Location: India
Concentration: Operations, Strategy
Schools: Tepper '17 (M$) W.P. Carey '17 (A$) NUS '17 (A)
GMAT 1: 760 Q49 V44
GPA: 3.88
WE:Engineering (Computer Software)
Products:
My Reviews
Schools: Tepper '17 (M$) W.P. Carey '17 (A$) NUS '17 (A)
GMAT 1: 760 Q49 V44
Posts: 789
Kudos: 2,736
Submit Your Own GMAT Math Questions - Get GMAT Club Tests 03 Jun 2013, 00:29
Kudos
Add Kudos
Bookmarks
Bookmark this Post
fameatop
It seems I am late to the party. Anyways better Late than Never. Here is my 2 cents
If x, y and z are three positive integers and x + y +z = 6 & z>1, then what is the probability that x equals 1?
(A) \(\frac{1}{2}\)
(B) \(\frac{1}{3}\)
(C) \(\frac{1}{4}\)
(D) \(\frac{3}{7}\)
(E) \(\frac{4}{7}\)

Answer
Show Spoiler
A

Explanation
Show Spoiler
X, Y & Z all Positive Integers and Z >1
Possible scenario's:- X Y Z
1 3 2
2 2 2
3 1 2
1 2 3
2 1 3
1 1 4
Favorable Scenarios = 3
Total Scenarios = 6
Thus probability = 3/6 = \(\frac{1}{2}\)
Show more

A shorter method can be as below:

X+Y+Z = 6, where X, Y => 1 and Z > 1, so minimum value Z can have is 2
Distribute 1 to X and Y each and Z = 2

Then X+Y+Z = 2 now to find out how many cases can have X=1, distribute 2 to Y and Z, that is Y+Z=2 -> 3C1 -> 3 ways
All the cases, X+Y+Z = 2 -> 4C2 - 6

Hence 3/6 = 1/2 A)
User avatar
fameatop
User avatar
Joined: 24 Aug 2009
Last visit: 09 Jun 2017
Posts: 382
Own Kudos:
2,550
Given Kudos: 275
Concentration: Finance
Schools:Harvard, Columbia, Stern, Booth, LSB,
Posts: 382
Kudos: 2,550
Submit Your Own GMAT Math Questions - Get GMAT Club Tests Updated on: 06 Jun 2013, 01:59
Originally posted by fameatop on 03 Jun 2013, 00:32.
Last edited by fameatop on 06 Jun 2013, 01:59, edited 3 times in total.
Kudos
Add Kudos
Bookmarks
Bookmark this Post
If J/K = 1/2, K/L= 3/2, L/M=4, M/N= 5/3 & N/O= 1/5, what is the approximate integer value of \(\frac{JKL}{MNO}\)?
(A) 360
(B) 36
(C) 4
(D) 40
(E) 3

Answer
Show Spoiler
D

Explanation
Show Spoiler
K = 2J
L=4J/3
M= J/3
N= J/5
O=J
\(\frac{JKL}{MNO}\) = 40
User avatar
kinjiGC
User avatar
Joined: 03 Feb 2013
Last visit: 12 Oct 2025
Posts: 789
Own Kudos:
2,736
Given Kudos: 567
Location: India
Concentration: Operations, Strategy
Schools: Tepper '17 (M$) W.P. Carey '17 (A$) NUS '17 (A)
GMAT 1: 760 Q49 V44
GPA: 3.88
WE:Engineering (Computer Software)
Products:
My Reviews
Schools: Tepper '17 (M$) W.P. Carey '17 (A$) NUS '17 (A)
GMAT 1: 760 Q49 V44
Posts: 789
Kudos: 2,736
Submit Your Own GMAT Math Questions - Get GMAT Club Tests 03 Jun 2013, 00:33
Kudos
Add Kudos
Bookmarks
Bookmark this Post
fameatop
If 50 < x < 61 and y = x + 5, what is the greatest possible integer value of x + y without approximation?
(A) 105
(B) 106
(C) 125
(D) 126
(E) 127

Answer
Show Spoiler
D

Explanation
Show Spoiler
Max value of X can be 60.9
Max value of Y can be 65.9
Max value of X+Y can be 126.8
If we had the leeway to round off, the answer would be 127. But in this case we don't have such leeway, so the answer will be 126
Show more

The expression to be maximized is 2X+5 and should be an integer value, so 2X should be an integer. Hence X can be 60.5 , the value would be 126 D)
User avatar
fameatop
User avatar
Joined: 24 Aug 2009
Last visit: 09 Jun 2017
Posts: 382
Own Kudos:
2,550
Given Kudos: 275
Concentration: Finance
Schools:Harvard, Columbia, Stern, Booth, LSB,
Posts: 382
Kudos: 2,550
Submit Your Own GMAT Math Questions - Get GMAT Club Tests Updated on: 03 Jun 2013, 00:55
Originally posted by fameatop on 03 Jun 2013, 00:36.
Last edited by fameatop on 03 Jun 2013, 00:55, edited 1 time in total.
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Tom wants to write GMAT, but because of unavailability of seats in his hometown he decides to schedule it in a nearby town that he is not fully aware of. On Test day he travels 10 mile due south followed by 20 miles west & finally 10 miles south again to reach the incorrect test center rather than travelling 10 mile due north followed by 20 miles east & finally 10 miles north again to reach the correct test center. What is the minimum distance Tom needs to travel so that he can appear for the test?
(A) 80
(B) 55
(C) 57
(D) 67
(E) 68

Answer
Show Spoiler
C

Explanation
Show Spoiler
If we draw the traveled distance using straight lines, we will get Isosceles Right angle triangle with sides 40 & 40. We are asked to find the Hypotenuse of this triangle.
Hypotenuse will be 40\(\sqrt{2}\) = 56.56= 57 miles
User avatar
fameatop
User avatar
Joined: 24 Aug 2009
Last visit: 09 Jun 2017
Posts: 382
Own Kudos:
2,550
Given Kudos: 275
Concentration: Finance
Schools:Harvard, Columbia, Stern, Booth, LSB,
Posts: 382
Kudos: 2,550
Submit Your Own GMAT Math Questions - Get GMAT Club Tests 03 Jun 2013, 00:37
Kudos
Add Kudos
Bookmarks
Bookmark this Post
A cunning trader bought unknown quantities of two varieties of salt costing 5 & 8$ per ounce and mixes them with 18 ounces of sand, which is available free of cost, to produce adulterated salt, which the trader will sell at below market price. At what price should the trader sell the mixture so that he can make 12.5% profit?

(A) If sand is not mixed with the salt, then the cost price of the mixture is 50% more than the final cost price of adulterated mixture or 33% more than the final sales price of adulterated mixture.

(B) Two salts are mixed in a ratio of 2:1

Answer
Show Spoiler
C

Explanation
Show Spoiler
In this question we have to find the cost price of adulterated mixture (2 types of salt & sand)
Let's assume that the cost price of adulterated mixture is 8c, so selling price will be 9c

Statement1:-If only two types of salts are mixed the cost price will be = 1.5 x cost price of adulterated mixture = 1.5 x 8c = 12c.
From this we can find that the 5 & 8$ salts are mixed in a ratio of (8-12c) & (12c-5).
Because the value of C is not known we can't find the value of this ratio.
Thus insufficient

Statement2:-Two salts are mixed in a ratio of 2:1.
From this we can find that if 5 & 8$ salts are mixed in a ratio of 2:1 , the cost price will be 6$/ounce

But we want the cost price of the mixture of salts & sand. We know that 18 ounces of sand is used.
In order to calculate the final cost price we should know either the amount of the salts, which is mixed with sand, or the ratio of salts & sand.
But we don't have the Exact amount of the salts or the the ratio of salts & sand.
Thus insufficient

Statement 1&2:-Combing both we will get the answer
Cost price of adulterated mixture will be 4$ or selling price will be 4.5$
User avatar
fameatop
User avatar
Joined: 24 Aug 2009
Last visit: 09 Jun 2017
Posts: 382
Own Kudos:
2,550
Given Kudos: 275
Concentration: Finance
Schools:Harvard, Columbia, Stern, Booth, LSB,
Posts: 382
Kudos: 2,550
Submit Your Own GMAT Math Questions - Get GMAT Club Tests Updated on: 07 Jun 2013, 18:58
Originally posted by fameatop on 03 Jun 2013, 23:59.
Last edited by fameatop on 07 Jun 2013, 18:58, edited 1 time in total.
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Simple concept but a very Challenging question
An inlet pipe fills tank A at a rate of 25 liter per minutes. 1st outlet pipe drawing water at a rate of 5 liter per minute from tank A is connected to bathroom & 2nd outlet pipe is connected to Tank B. The 2nd outlet pipe will draw water, at a rate of 15 liter per minute, only if the water level in Tank A is > 50%. One outlet pipe drawing water at a rate of 5 liter per minute from tank B is connected to Kitchen. Capacity of Tank A & B is 800 & 600 liter respectively. Both the tanks are empty at the beginning & all the taps are turned on since the beginning. How much less time (in minutes) will Tank B take to fill completely than the time taken by Tank A to fill completely from the moment Tank A starts transferring water to Tank B?
(A) 20
(B) 40
(C) 60
(D) 80
(E) 100

Answer
Show Spoiler
A

Explanation
Show Spoiler
Net Filling rate for Tank A before it reaches 50% of capacity = (25-5) = 20 lit/min
Time taken by Tank A to fill initial 50% of capacity = 400/(25-5) = 20 min
Net Filling rate for Tank A after it reaches 50% of capacity = (25-5-15) = 5 lit/min
Time taken by Tank A to fill the remaining 50% of capacity = 400/(5) = 80 min

Net Filling rate for Tank B = (15-5) = 10 lit/min
Time taken by Tank B to fill completely = 600/10 = 60 min

Thus Tank B take will take (80-60) 20 min less to fill completely than the time taken by Tank A to fill completely from the moment Tank A starts transferring water to Tank B
User avatar
fameatop
User avatar
Joined: 24 Aug 2009
Last visit: 09 Jun 2017
Posts: 382
Own Kudos:
2,550
Given Kudos: 275
Concentration: Finance
Schools:Harvard, Columbia, Stern, Booth, LSB,
Posts: 382
Kudos: 2,550
Submit Your Own GMAT Math Questions - Get GMAT Club Tests Updated on: 07 Jun 2013, 19:01
Originally posted by fameatop on 04 Jun 2013, 00:20.
Last edited by fameatop on 07 Jun 2013, 19:01, edited 2 times in total.
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Simple concept but very Tricky
An inlet pipe starts filling an empty tank A at a rate of 25 liter per minute at 11:00 am, while an outlet pipe draws water from tank A & fills empty tank B at a rate of 20 liter per minute only if the water level in Tank A is > 20%. Likewise, an outlet pipe draws water from tank B & fills empty tank C at a rate of 15 liter per minute only if the water level in Tank B is > 40%. Lastly, an outlet pipe draws water from tank C & fills empty tank D at a rate of 10 liter per minute only if the water level in Tank C is > 50%. Capacity of Tank A, B, C & D is 1000, 800, 600 & 400 liter respectively. At what time all the tanks will be completely filled?
(A) 12:24 noon
(B) 1:40 pm
(C) 1:48 pm
(D) 4:56 pm
(E) 5:40 pm

Answer
Show Spoiler
C

Explanation
Show Spoiler
Time taken by Tank A to fill initial 20% of capacity = 200/25 = 8 min
Net Filling rate for Tank A after it reaches 20% of capacity = (25-20) = 5 lit/min
Time taken by Tank A to fill the remaining 80% of capacity = 800/5 = 160 min

Tank A will take the longest to fill. By the time Tank A is full all the other tanks will be full.
Thus the time at which all the tanks will be full= 8+160 = 168 min = 2 hrs 48 minutes.

Attachments

Flow.png
Flow.png [ 2.61 KiB | Viewed 3729 times ]

User avatar
fameatop
User avatar
Joined: 24 Aug 2009
Last visit: 09 Jun 2017
Posts: 382
Own Kudos:
2,550
Given Kudos: 275
Concentration: Finance
Schools:Harvard, Columbia, Stern, Booth, LSB,
Posts: 382
Kudos: 2,550
Submit Your Own GMAT Math Questions - Get GMAT Club Tests 04 Jun 2013, 01:25
Kudos
Add Kudos
Bookmarks
Bookmark this Post
A water heater boils the water in 15 minutes on Low heat or in 10 minutes on Medium heat or in 5 minutes on High heat. On Sunday, water heater heats the water in 8 minutes. For how long heater was on Medium Heat mode?
(A) Capacity of Water heater is 25 liters.
(B) Ratio of efficiency on Low, Medium & High heat is 2:3:6

Answer
Show Spoiler
Soon

Explanation
Show Spoiler
Soon
User avatar
emmak
User avatar
Joined: 09 Feb 2013
Last visit: 08 Jul 2014
Posts: 103
Own Kudos:
4,854
Given Kudos: 17
Posts: 103
Kudos: 4,854
Submit Your Own GMAT Math Questions - Get GMAT Club Tests Updated on: 16 Jun 2013, 04:38
Originally posted by emmak on 07 Jun 2013, 19:43.
Last edited by emmak on 16 Jun 2013, 04:38, edited 1 time in total.
Kudos
Add Kudos
Bookmarks
Bookmark this Post
A Train starts traveling from station A towards station B. The moment train starts traveling a Radar, situated at station B, emits a wave that travels towards the moving train at a rate of 50km/hr. The wave is reflected back to station B as soon as it hits the front of the train and this process goes on till train reaches station B. What is the total distance covered by the wave?
(A) Speed of the train is 25 Km/hr .
(B) Train takes 1 Hr to reach station B

Answer
Show Spoiler
B

Explanation
Show Spoiler
Soon
User avatar
emmak
User avatar
Joined: 09 Feb 2013
Last visit: 08 Jul 2014
Posts: 103
Own Kudos:
4,854
Given Kudos: 17
Posts: 103
Kudos: 4,854
Submit Your Own GMAT Math Questions - Get GMAT Club Tests Updated on: 16 Jun 2013, 04:21
Originally posted by emmak on 07 Jun 2013, 19:50.
Last edited by emmak on 16 Jun 2013, 04:21, edited 1 time in total.
Kudos
Add Kudos
Bookmarks
Bookmark this Post
A guy standing at the platform sees a Train coming toward him . In order to touch the rear end of the train of the train, he starts running away from the train. At what speed should he run so that he could touch the rear end of the train?
(A) Speed of the train is 40 km/hr.
(B) The moment guy sees the front of the train, the distance between the guy & the train is 10 Km

Answer
Show Spoiler
E

Explanation
Show Spoiler
Soon
User avatar
fameatop
User avatar
Joined: 24 Aug 2009
Last visit: 09 Jun 2017
Posts: 382
Own Kudos:
2,550
Given Kudos: 275
Concentration: Finance
Schools:Harvard, Columbia, Stern, Booth, LSB,
Posts: 382
Kudos: 2,550
Submit Your Own GMAT Math Questions - Get GMAT Club Tests 13 Jun 2013, 19:26
Kudos
Add Kudos
Bookmarks
Bookmark this Post
prateekbhatt
There are c number of cats and d number of dogs in a certain apartment complex. If there is at least one dog in the complex, is the number of dogs greater than the number of cats?
1- c/d<2
2- c^2/d^2>1
Show more

Hi Prateek,

This is a Veritas question and thus a copyrighted material.
User avatar
cyberjadugar
User avatar
Joined: 29 Mar 2012
Last visit: 01 Apr 2026
Posts: 264
Own Kudos:
1,814
Given Kudos: 23
Location: India
GMAT 1: 640 Q50 V26
GMAT 2: 660 Q50 V28
GMAT 3: 730 Q50 V38
GMAT 3: 730 Q50 V38
Posts: 264
Kudos: 1,814
Submit Your Own GMAT Math Questions - Get GMAT Club Tests 05 Jul 2013, 02:18
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Parallelogram ABCD is to be constructed in the xy-plane such that the sides are parallel to x and y axis. The x and y coordinates of A, B, C and D are to be integers that lies between the lines |x-1| = 5 and |y+5| = 6. How many different parallelograms with these properties could be constructed?
(A) 10
(B) 110
(C) 1980
(D) 9900
(E) 4980

Show SpoilerAnswer
(C)
User avatar
mau5
User avatar
Verbal Forum Moderator
Joined: 10 Oct 2012
Last visit: 31 Dec 2024
Posts: 478
Own Kudos:
3,386
Given Kudos: 141
Posts: 478
Kudos: 3,386
Submit Your Own GMAT Math Questions - Get GMAT Club Tests 28 Jul 2013, 05:22
Kudos
Add Kudos
Bookmarks
Bookmark this Post
For a given triangle with sides x,3x and 24, what is the value of the perimeter?

I. The perimeter is a perfect square.

II.(x-3)(x-10) = 0
User avatar
swati007
User avatar
Joined: 14 Jun 2011
Last visit: 22 May 2015
Posts: 51
Own Kudos:
276
Given Kudos: 15
GMAT 1: 560 Q41 V25
Posts: 51
Kudos: 276
Submit Your Own GMAT Math Questions - Get GMAT Club Tests 26 Aug 2013, 09:57
Kudos
Add Kudos
Bookmarks
Bookmark this Post
How many zeros exist in the end of the product of alphabets(a-z) where a = 4^4, b = 5^5, c = 6^6, ....z = 29^29?

a) 99
b) 100
c) 101
d)102
e)103
User avatar
Narenn
User avatar
Major Poster
Joined: 22 Feb 2012
Last visit: 21 Apr 2026
Posts: 9,290
Own Kudos:
11,302
Given Kudos: 4,711
Affiliations: GMAT Club
Test: Test
Posts: 9,290
Kudos: 11,302
Submit Your Own GMAT Math Questions - Get GMAT Club Tests 26 Aug 2013, 10:16
Kudos
Add Kudos
Bookmarks
Bookmark this Post
swati007
How many zeros exist in the end of the product of alphabets(a-z) where a = 4^4, b = 5^5, c = 6^6, ....z = 29^29?

a) 99
b) 100
c) 101
d)102
e)103
Show more

I think, It is 100.

A zero is created when 2 is multiplied by 5. So we should find out how many multiplications of 2 and 5 are possible in the expression.
Obviously 2 will occur more frequently than does 5. So number of 5 in the above expression will determine the number of zeros.

5 can be found in following terms

5^5 = 5 times

10^10 = 10 times

15^15 = 15 times

20^20 = 20 times

25^25 = 50 times

Total = 100 times. So 100 zeros should be there.
User avatar
swati007
User avatar
Joined: 14 Jun 2011
Last visit: 22 May 2015
Posts: 51
Own Kudos:
276
Given Kudos: 15
GMAT 1: 560 Q41 V25
Posts: 51
Kudos: 276
Submit Your Own GMAT Math Questions - Get GMAT Club Tests 26 Aug 2013, 10:28
Kudos
Add Kudos
Bookmarks
Bookmark this Post
thats right...
is the competition closed now? i didnt see any kudos to latest posts..
User avatar
Narenn
User avatar
Major Poster
Joined: 22 Feb 2012
Last visit: 21 Apr 2026
Posts: 9,290
Own Kudos:
11,302
Given Kudos: 4,711
Affiliations: GMAT Club
Test: Test
Posts: 9,290
Kudos: 11,302
Submit Your Own GMAT Math Questions - Get GMAT Club Tests 26 Aug 2013, 10:36
Kudos
Add Kudos
Bookmarks
Bookmark this Post
swati007
thats right...
is the competition closed now? i didnt see any kudos to latest posts..
Show more

It's closed quite long back
User avatar
bumpbot
User avatar
Non-Human User
Joined: 09 Sep 2013
Last visit: 04 Jan 2021
Posts: 38,956
Own Kudos:
1,117
Posts: 38,956
Kudos: 1,117
Submit Your Own GMAT Math Questions - Get GMAT Club Tests 04 Jan 2018, 03:41
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Automated notice from GMAT Club BumpBot:

A member just gave Kudos to this thread, showing it’s still useful. I’ve bumped it to the top so more people can benefit. Feel free to add your own questions or solutions.

This post was generated automatically.
   1   2   3 
Moderators:
Bunuel
Math Expert
109728 posts
Krunaal
Tuck School Moderator
853 posts