Search found 36 matches
magical cook wrote:If n is an integer between 10 and 99, is n < 80 ?
(1) The sum of the two digits of n is a prime number.
(2) Each of the two digits of n is a prime number.
The answer for this is B I have the GMAT Prep answer and it is B.
I think B but it says C..
- by rbansal
Mon May 16, 2011 5:33 pm- Forum: Data Sufficiency
- Topic: answer correct? 32
- Replies: 12
- Views: 4164
Hello, When you got that 1 man takes 500 days to complete the task. I understand you just did 25 x 20 but can you please explain the rational behind it. I am getting very stuck on why 1 man would take 500 days to complete the task . Thank you, RB 25 men take 20 days to complete a piece of work => 1 ...
- by rbansal
Mon May 16, 2011 4:28 pm- Forum: Problem Solving
- Topic: 25 men reap a field in 20 days
- Replies: 7
- Views: 19910
40 hours Let Total work: 120 units Speed of X: 10 units(since his rate is 12 hours to complete the work) Speed of Y : 1 units per hour(1/10 of X) Work Finished by X= 120*2/3=80 Work Left= 120-80=40 Tim taken by Y 40/1= 40 hours Hello when I did the problem, I actually took 2/3 of the total for X an...
- by rbansal
Mon May 16, 2011 1:06 pm- Forum: Problem Solving
- Topic: TIME AND WORK
- Replies: 8
- Views: 6377
X takes 12 hrs to finish his work... At that rate he finished 2/3 of the work. So remainig work is 1/3. Y's rate is 1/10th of X. ie. Y takes 10 times longer to finish his work. ==> 120 hrs At the of 120 hrs how long will he take to finish 1/3 of the work ? = 120/3 = 40 hrs. HT helps If we didn't pi...
- by rbansal
Mon May 16, 2011 1:00 pm- Forum: Problem Solving
- Topic: TIME AND WORK
- Replies: 8
- Views: 6377
I am getting very confused with this question. I rationalized it as, it takes 2 days for each machine to complete the job in 12 days. If they are to complete the job in 8 days they will need two more machines both working at a rate of 2days a job. Where is my logic incorrect? A helpful technique for...
- by rbansal
Sun May 15, 2011 2:28 pm- Forum: Problem Solving
- Topic: Six machines each working at same constant rate together can
- Replies: 23
- Views: 18191
I am not sure if i approached this right, please tell me if this is a correct method? 6R X12days =1job 6R= 1/12 R= 1/72 so rate of one machine is 1/72 now 1/72M x 8 days=1 job 1/72M=1/8 M=1/8X72 M=9 If 9 machines will do the job in 8 days, then 9 - 6 =3 will number of additional machines I am unsur...
- by rbansal
Sun May 15, 2011 2:25 pm- Forum: Problem Solving
- Topic: Six machines each working at same constant rate together can
- Replies: 23
- Views: 18191
Data Sufficiency Question
Hello I unfortunately did not save the answer to the attached question is the answer C?
And an explanation please 
- by rbansal
Fri May 13, 2011 6:22 pm- Forum: Problem Solving
- Topic: Data Sufficiency Question
- Replies: 3
- Views: 947
At a certain theater, the cost of each adult's ticket is $5 and the cost of each child's ticket is $2. What was the average cost of all the adult's and children's tickets sold at the theater yesterday? 1) Y''day ratio of # of children's ticket sold to the # of adult's ticketr sold was 3 to 2 2) Y'd...
- by rbansal
Fri May 13, 2011 6:03 pm- Forum: Data Sufficiency
- Topic: Gmat Prep - Theater Tickets
- Replies: 9
- Views: 5408
Is statement 2 in this question wrong
Hello the quadratic equation in statement 2 isnt it completely wrong.
Can you even solve anything like this?
Because doesnt -4 x -6 =24 not negative -24
- by rbansal
Fri May 13, 2011 1:43 pm- Forum: Problem Solving
- Topic: Is statement 2 in this question wrong
- Replies: 1
- Views: 861
Remainder and 1
Can someone please help me with this, I was listening to a GMAT PREP Lesson And the question was Is k+5/5 and integer? Statement 1: When K is divided by 5, the remainder is 1? Statement 1, was insufficient and they explained it by say 1 divided by 5 is equal to 0 with a remainder of 1. Are there num...
- by rbansal
Fri May 13, 2011 12:44 pm- Forum: Problem Solving
- Topic: Remainder and 1
- Replies: 2
- Views: 1125
GMAT PREP NEGATIVE CUBE ROOT PROBLEM
Hello I have the question attached, can someone please help me answer this?
- by rbansal
Tue May 10, 2011 9:57 am- Forum: Problem Solving
- Topic: GMAT PREP NEGATIVE CUBE ROOT PROBLEM
- Replies: 2
- Views: 1111
- by rbansal
Tue May 10, 2011 8:59 am- Forum: Problem Solving
- Topic: GMATPrep Problem
- Replies: 10
- Views: 3665
I Followed you all up until the last line can you clarify that pleasesourabh33 wrote:D
4^17 - 2^28
2^34 - 2^28
2^28(2^6 -1)
2^28(64-1)
2^28(63)
2^28.3^2.7
Therefore 7 should be the greatest prime factor.
- by rbansal
Mon May 09, 2011 6:51 pm- Forum: Problem Solving
- Topic: Factoring exponents
- Replies: 3
- Views: 1017
Factoring exponents
What is the greatest prime factor of 4^17 - 2^28?
a.2
b.3
c.5
d.7
e.11
Can someone please help me with this, with a step by step explanation
Thank you
- by rbansal
Mon May 09, 2011 6:15 pm- Forum: Problem Solving
- Topic: Factoring exponents
- Replies: 3
- Views: 1017
AlaaQasem wrote:You are right but for the last statement it is going to be like this instead:
5^x-3 ((5^3) - 1)
Why is it a 3 and not a 2?
- by rbansal
Mon May 09, 2011 5:39 pm- Forum: Problem Solving
- Topic: Question about factoring (should be simple)
- Replies: 5
- Views: 2598