Search found 23 matches
working with powers from gmat prep
can someone help me with this headeache here pleaseee?
2^X-2^x-1=3(2)^13 what is the value of x?
CORRECT ANS. 15
Thank you 
- by cat er ina
Wed Apr 28, 2010 3:30 am- Forum: Problem Solving
- Topic: working with powers from gmat prep
- Replies: 2
- Views: 1030
that is true for non-native english speakers language barrier makes up for a big big part the issues we meet when working out problems!!anwarma wrote:dbart06! Thanks! I got it now! It si all a matter understanding the language!
- by cat er ina
Wed Apr 28, 2010 3:09 am- Forum: Problem Solving
- Topic: GMAT PREP Questions
- Replies: 5
- Views: 3465
If we stick to just the basics; ( which gets me out of a lot of trouble) w=r t pump 1 slower = 1 job per hour pump 2 faster = 1.5 jobs per hour combined rate = 2.5 jobs per hour multiplied by the 4 hour work time. This yields the W work, which is 10. so simply plug plug back into the w = r t formul...
- by cat er ina
Wed Apr 28, 2010 1:21 am- Forum: Problem Solving
- Topic: GMAT PREP WORK PROB?
- Replies: 13
- Views: 7828
really helpful of ufrank1 wrote:ans is 16 and easist of the lot i have seen so far in this forum....lol
- by cat er ina
Sun Apr 25, 2010 11:06 am- Forum: Problem Solving
- Topic: gross profit
- Replies: 6
- Views: 2460
one thing i don t get is why 125% of 80? where do you get that from?cramya wrote:Let x be the cost price
125% of x = 80
x = 64
Check:
25% of 64 is 16 so 64+16 = 80)
Hope this helps
- by cat er ina
Sun Apr 25, 2010 10:26 am- Forum: Problem Solving
- Topic: gross profit
- Replies: 6
- Views: 2460
No luck solving this. Please help. http://andresnaranjo.typepad.com/gmat/anv_geo2.png Options are: a) 1/2 b) 1 c) sqrt 2 d) sqrt 3 e) sqrt 2 / 2 B is correct answer. (s,t) will be (1, sqrt 3), radius is 2 . Angle O is 60 degress on left and 30 degrees on right since sin 360=sqrt 3/2 B is correct, b...
- by cat er ina
Sun Apr 25, 2010 6:51 am- Forum: Problem Solving
- Topic: GMAT Prep - Geometry
- Replies: 21
- Views: 9523
Which of the following is the closest to ∛ 2.539 (cube root of 2.539) ? Can someone help me with this one please? You luckily have 2539/1000 to determine the cube root of. Rough estimation takes it somewhere around 2500/1000 = 20/8. Now, cube root of 8 is 2, and that of 20 is pretty less than 3, ...
- by cat er ina
Sat Apr 24, 2010 1:18 am- Forum: Problem Solving
- Topic: cube root
- Replies: 6
- Views: 2256
Which of the following is the closest to ∛ 2.539 (cube root of 2.539) ? Can someone help me with this one please? You luckily have 2539/1000 to determine the cube root of. Rough estimation takes it somewhere around 2500/1000 = 20/8. Now, cube root of 8 is 2, and that of 20 is pretty less than 3, ...
- by cat er ina
Sat Apr 24, 2010 1:16 am- Forum: Problem Solving
- Topic: cube root
- Replies: 6
- Views: 2256
cube root
Which of the following is the closest to ∛ 2.539 (cube root of 2.539) ?
Can someone help me with this one please?
- by cat er ina
Sat Apr 24, 2010 12:02 am- Forum: Problem Solving
- Topic: cube root
- Replies: 6
- Views: 2256
You have to use the rate formula here 1/t = 1/t1 + 1/t2 = 1/30 + 1/20 = 1/12 So, 12 minutes Put another way, in each minute the pipes can fill 1/30 and 1/20 of the pool respectively. So, combined the hoses can fill (1/30 + 1/20) of the pool per minute. The reciprocal of this value will give you the...
- by cat er ina
Thu Apr 15, 2010 12:45 am- Forum: Problem Solving
- Topic: GMATPREP Constant Rate
- Replies: 8
- Views: 10784
neerajkumar1_1 wrote:the mean(or avg)=sum/total
hence (n+2+2n-3+4n+1+7n+4)/4=15
=> 14n + 4 = 60
=> 14n = 56
=> n = 4
TRUEEE How silly I used to set everything equal15 which is not the product of the set but the average!
thank you guys you are a salvation!
- by cat er ina
Thu Apr 15, 2010 12:34 am- Forum: Problem Solving
- Topic: average
- Replies: 3
- Views: 5009
average
It's the second time that it shows up on my gmat prep test and still don't get this!!
If the average of the 4 numbers n+2, 2n-3, 4n+1 AND 7n+4 is 15 what is the value of n?
11/14, 4 , 32/7, 11, 13
the answer is 4
THANK YOU IN ADVANCE!!
- by cat er ina
Thu Apr 15, 2010 12:10 am- Forum: Problem Solving
- Topic: average
- Replies: 3
- Views: 5009
You have to use the rate formula here 1/t = 1/t1 + 1/t2 = 1/30 + 1/20 = 1/12 So, 12 minutes Put another way, in each minute the pipes can fill 1/30 and 1/20 of the pool respectively. So, combined the hoses can fill (1/30 + 1/20) of the pool per minute. The reciprocal of this value will give you the...
- by cat er ina
Wed Apr 14, 2010 11:53 pm- Forum: Problem Solving
- Topic: GMATPREP Constant Rate
- Replies: 8
- Views: 10784
but guys explain this..together statement 1 and 2 why is not sufficient??? because it seems to me that there have to be 3 negative and three positive numbers since the product has to be negative!!! so not considering the order +*-*-*+*-*+ or +*-*+*-*+*- anyway it s 3 pos numbers and 3 neg numbers H...
- by cat er ina
Wed Apr 14, 2010 11:39 pm- Forum: Problem Solving
- Topic: Set theory
- Replies: 5
- Views: 2666
63) S is finite set of numbers. Does S contain more negative numbers than positive numbers? a. Product of all numbers in S is -1200 b. There are 6 numbers in S Please explain.. It is a question of data sufficiency so should be posted in data sufficiency forum Well for the solution of this problem. ...
- by cat er ina
Wed Apr 14, 2010 7:38 am- Forum: Problem Solving
- Topic: Set theory
- Replies: 5
- Views: 2666