Search found 17 matches
GMATprep question
If k is not equal to 0, 1, or -1, is 1/k>0? (1) 1/(k-1)>0 (2) 1/(k+1)>0 My question is why B isn't correct. If k is not 0,1 or -1 it can be 2,3 ... and it can be -2,-3 etc. If we say that k is 2 than 1/(2+1) > 0 true But, since it can't be -1 if k is negative the fraction can be >0. Doesn't that mak...
- by princessss
Mon Oct 25, 2010 12:40 pm- Forum: Problem Solving
- Topic: GMATprep question
- Replies: 5
- Views: 1376
650 - 800 question
At a technology consulting firm with x computers, all of which are laptops or destkops, 30% are laptops; if 80% of the total number of computers have more than 1GB of RAM and 10% of the computers with less than 1 GB of RAM are laptops ( and no computers have exactly 1GB of RAM), approximately what p...
- by princessss
Sun Oct 17, 2010 2:21 pm- Forum: Problem Solving
- Topic: 650 - 800 question
- Replies: 4
- Views: 3155
thank for your help
- by princessss
Tue Oct 12, 2010 12:13 pm- Forum: Problem Solving
- Topic: percentage problem
- Replies: 5
- Views: 1533
It should be 85. Someone posted here on the forum 198 quantitative questions in a word document and I got this problem there, it is possible that there is a mistake, I found some mistakes already in the document. I was also confused about the other class and the number of students in it. I posted th...
- by princessss
Tue Oct 12, 2010 11:49 am- Forum: Problem Solving
- Topic: percentage problem
- Replies: 5
- Views: 1533
quadrant problem
if ab does not equal 0, and (-a.b) and (-b,a) are in the same quadrant, is (-x,y) in this quadrant?
(1) xy>0
(2) ax>0
- by princessss
Tue Oct 12, 2010 7:15 am- Forum: Data Sufficiency
- Topic: quadrant problem
- Replies: 21
- Views: 12415
percentage problem
Angela's grade was in the 90th percentile out of 80 grades in her class. In another class there were 19 grades higher than Angela's. If nobody had Angela's grade, then Angela was what percentile of the two classes combined?
a) 72
b) 80
c) 81
d) 85
e) 92
- by princessss
Tue Oct 12, 2010 7:05 am- Forum: Problem Solving
- Topic: percentage problem
- Replies: 5
- Views: 1533
- by princessss
Sun Oct 10, 2010 10:42 am- Forum: Data Sufficiency
- Topic: GMATprep problem
- Replies: 3
- Views: 1309
- by princessss
Sun Oct 10, 2010 3:18 am- Forum: Problem Solving
- Topic: ratio problem
- Replies: 4
- Views: 1063
GMATprep problem
If x is positive number less than 10, is z greater than average of x and 10? (1) z is closer to 10 than x on the number line (2) z= 5x It is said that A is the correct answer, but how? If we, for example, take 9 for z and 8 for x we get that z is equal to average of x and 10 and therefore not greate...
- by princessss
Sun Oct 10, 2010 2:46 am- Forum: Data Sufficiency
- Topic: GMATprep problem
- Replies: 3
- Views: 1309
ratio problem
When a tree was planted it was 4 feet. Its height increased by a constant amount each year for 6 years. after 6 years the tree was 1/5 taller than at the end of 4th year. By how many feet did the height of the tree increase each year?
a) 3/10
b) 2/5
c) 1/2
d) 2/3
e) 6/5
- by princessss
Sun Oct 10, 2010 2:00 am- Forum: Problem Solving
- Topic: ratio problem
- Replies: 4
- Views: 1063
% problem
The rate of a reaction is directly proportional to the square of the concentraton of A and inversely proportional to concentration of B. If B increases by 100%, which of the following is closest to the % change in concentration of A required to keep the rate unchanged? A) 100% decrease B) 50% decrea...
- by princessss
Fri Oct 08, 2010 2:24 am- Forum: Problem Solving
- Topic: % problem
- Replies: 1
- Views: 847
Fraction problem
Alices' take home - pay last year was the same each month, and she saved the same praction of her take - home pay each month. The total amount of money that she had saved at the end of the year was 3 times the amount of that portion of her monthly take - home pay that she didn't save. If all the mon...
- by princessss
Thu Oct 07, 2010 2:52 am- Forum: Problem Solving
- Topic: Fraction problem
- Replies: 2
- Views: 1035
- by princessss
Tue Oct 05, 2010 9:21 am- Forum: Problem Solving
- Topic: rate problem
- Replies: 2
- Views: 1038
rate problem
Six machines working at the same constant rate, together can complete a certain jos in 12 days. How many aditional machines, each working at the same constant rate,will be needed to complete a job in 8 days?
Does anyone know how the answer to this question and how to get it?
Thanks 
- by princessss
Tue Oct 05, 2010 8:53 am- Forum: Problem Solving
- Topic: rate problem
- Replies: 2
- Views: 1038
- by princessss
Wed Sep 29, 2010 6:22 am- Forum: Problem Solving
- Topic: help
- Replies: 2
- Views: 924