Search found 406 matches
For the 'varying speed' scenario, we need to know the relative percentages of the 40 miles that were spent driving at X mi/hr vs. driving at 1.25X mi/hr. Without even inserting numbers for proof, there's a huge difference between driving for 1 mile at X mi/hr (39 miles at 1.25X mi/hr) and driving 39...
- by tomada
Fri May 11, 2012 2:54 pm- Forum: Data Sufficiency
- Topic: NEW GMATPrep CAT question
- Replies: 1
- Views: 987
I see that the parentheses comes first, so we get 10^3^2, but I don't see why this becomes 10^(3^2) instead of (10^3)^2. The negative of -3 is the only term within brackets, so both the "10^" and "^2" operations are outside of the term in parentheses/brackets. With operations at ...
- by tomada
Fri May 11, 2012 1:24 pm- Forum: Problem Solving
- Topic: exponent rule
- Replies: 6
- Views: 1014
Oops, I goofed. I thought this was an infinite series, but now I realize that the series ends at 1/(18*20), which means that Aneesh' solution is correct. I solved for an infinite series, meaning that the next terms would have been 1/(20*22) + 1/(22*24) + 1/(24*26)…. On another note, how does one d...
- by tomada
Sat May 05, 2012 4:57 am- Forum: Problem Solving
- Topic: sum of the series
- Replies: 7
- Views: 2030
In Aneesh' solution, the sum of infinite terms = 9/40, which equals 0.225.
The first nine terms of the series are 1/8, 1/24, 1/48, 1/80, 1/120, 1/168, 1/224, 1/288, 1/360.
These terms add up to 0.225, so any terms thereafter will make the sum greater than 9/40.
Therefore, the answer cannot be 9/40.
- by tomada
Sat May 05, 2012 4:47 am- Forum: Problem Solving
- Topic: sum of the series
- Replies: 7
- Views: 2030
Here's how I approached it...we need to select 3 different consonants and 2 different vowels. Since there are 21 consonants in the alphabet, there are 21 ways to select the first of three consonants. The next consonant must be different, so there are now 20 ways to select the 2nd consonant. The thir...
- by tomada
Fri May 04, 2012 2:26 pm- Forum: Problem Solving
- Topic: 2 vowels and 3 consonants
- Replies: 11
- Views: 18994
I think the answer is (A). The volume of a cylinder is expressed as Pi*(r^2)*h, such that r=radius of circular cylindrical base and h=height of cylinder. . The volume of a sphere is expressed as (4/3)*Pi*(r^3), such that r=radius of sphere. For both the height AND radius of the cylinder to equal the...
- by tomada
Fri May 04, 2012 2:07 pm- Forum: Problem Solving
- Topic: Cylinder and a sphere
- Replies: 1
- Views: 1189
I think the answer is (D).
From 21 consonants and 5 vowels.
# of ways to choose 3 different consonants: 21 * 20 * 19 = P(21,3)
# of ways to choose 2 different vowels: 5 * 4 = P(5,2)
Since order counts (producing different words), there are 5! ways to arrange the letters once they are selected.
- by tomada
Fri May 04, 2012 1:47 pm- Forum: Problem Solving
- Topic: 2 vowels and 3 consonants
- Replies: 11
- Views: 18994
- by tomada
Fri May 04, 2012 1:32 pm- Forum: Problem Solving
- Topic: Currency problem - GMAT Prep
- Replies: 11
- Views: 3135
First I noticed that 1/8 can be factored out of each term, as follows: 1/8 * (1/1 + 1/3 + 1/6 + 1/10 + 1/15 + 1/21 + ...) Notice an interesting pattern with the denominators inside the parentheses? From the first term to the second term, the difference between the denominators = 2 From the second te...
- by tomada
Fri May 04, 2012 1:25 pm- Forum: Problem Solving
- Topic: sum of the series
- Replies: 7
- Views: 2030
Be careful. The units digit of 'p' is determined to be '6', but that's not the answer. We're being asked for the units digit of p + 3 . So, if you had selected (B)on a test, you'd be incorrect. p^3 and p^2 unit digit is 0 that implies P is such type of number which has same unit digit as p*p*p or p*...
- by tomada
Fri May 04, 2012 8:14 am- Forum: Problem Solving
- Topic: Units Digit!
- Replies: 6
- Views: 2650
What do you mean by "positive units digit"? Given that p is a positive even integer with a positive units digit, if the units digit of p^3 minus the units digit of p^2 is equal to 0, what is the units digit of p + 3? A)3 B)6 C)7 D)9 E)CAN'T BE DETERMINED OA after some discussion I stand co...
- by tomada
Fri May 04, 2012 8:06 am- Forum: Problem Solving
- Topic: Units Digit!
- Replies: 6
- Views: 2650
I calculated the answer to be 1/4. I don't think you'll see this type of question on the GMAT, though.
- by tomada
Fri May 04, 2012 7:55 am- Forum: Problem Solving
- Topic: sum of the series
- Replies: 7
- Views: 2030
Online MBA vs Full-Time
Hello,
Do you believe that employers, in general, view Online MBAs as less stringent and/or less valuable than the standard, full-time MBA?
Regards,
Daniel Toma
- by tomada
Fri May 04, 2012 5:56 am- Forum: Ask Stacy Blackman
- Topic: Online MBA vs Full-Time
- Replies: 1
- Views: 1006
For the 2nd problem, I observed that both 4 and 6 (her walking speeds to and from work, respectively) factor evenly into 12, so I chose 12 miles as the one-way distance. Her walking speed to work is 4 mph. With a distance of 12 miles, this would require 3 hours of walking. Her walking speed from wor...
- by tomada
Fri Apr 20, 2012 4:05 pm- Forum: Problem Solving
- Topic: Rates & Work Problems - Manhattan Gmat
- Replies: 6
- Views: 3905
(2^3)/7 -> Remainder = 1 (2^4)/7 -> Remainder = 2 (2^5)/7 -> Remainder = 4 (2^6)/7 -> Remainder = 1 (2^7)/7 -> Remainder = 2 (2^8)/7 -> Remainder = 4 …and this pattern continues… (2^9)/7 -> Remainder = 1 (2^10)/7 -> Remainder = 2 When the exponent is 3,6,9,12, etc., the Remainder = 1 When the ex...
- by tomada
Sun Apr 15, 2012 7:36 pm- Forum: Problem Solving
- Topic: remainder
- Replies: 16
- Views: 7557