Search found 30 matches
- by bia
Sat May 31, 2008 5:52 am- Forum: Problem Solving
- Topic: Mixture
- Replies: 2
- Views: 1400
- by bia
Sat May 31, 2008 4:40 am- Forum: Data Sufficiency
- Topic: Prime numbers
- Replies: 1
- Views: 1184
- by bia
Sat May 31, 2008 4:38 am- Forum: Problem Solving
- Topic: Mixture
- Replies: 2
- Views: 1400
I have difficulty in probability problem
Set S consists of all prime integers less than 10. If a number is selected from set S at random and then another number, not necessarily different, is selected from set s at random, what is the probability that the sum of these numbers is odd?
A. 1/8
B. 1/6
C. 3/8
D. 1/2
E. 5/8
- by bia
Thu May 29, 2008 6:20 am- Forum: Problem Solving
- Topic: I have difficulty in probability problem
- Replies: 3
- Views: 1458
Counting
How many odd three-digit integers greater than 800 are there such that all their digits are different?
A. 40
B. 56
C. 72
D. 81
E. 104
- by bia
Wed May 28, 2008 6:14 am- Forum: Problem Solving
- Topic: Counting
- Replies: 3
- Views: 1633
Ans is 27/40 Assume that we have 200 apartments We call T is set of apartments that have terrace S is set of apartments that have skylight The number of apartments that have terrace = 1/4 x 200 = 50 The number of apartments that have skylight = 1/8 x 200 = 25 The number of apartments that have both ...
- by bia
Sun May 25, 2008 10:06 pm- Forum: Problem Solving
- Topic: Try this one in less than 2 mins?
- Replies: 8
- Views: 2612
- by bia
Sun May 18, 2008 9:53 pm- Forum: Critical Reasoning
- Topic: 1000 CR Test C , Q15
- Replies: 3
- Views: 2286
I thought "If Dr.Jones had become a doctor 10 years earlier than he did" means y - 10
Did I have a reading skill problem?
- by bia
Sun May 18, 2008 9:39 pm- Forum: Data Sufficiency
- Topic: Age
- Replies: 5
- Views: 3870
- by bia
Sun May 18, 2008 9:26 pm- Forum: Data Sufficiency
- Topic: Age
- Replies: 5
- Views: 3870
- by bia
Sun May 18, 2008 9:20 pm- Forum: Problem Solving
- Topic: Circle
- Replies: 5
- Views: 2308
Circle
My answer is : 4sqrt(3). Anyone has the same answer as I ?
The points R,T and U lie on a circle that has radius 4. If the length of arc RTU is 4pi/3, what is the length of line segment RU?
A. 4/3
B. 8/3
C. 3
D. 4
E. 6
- by bia
Sun May 18, 2008 5:18 am- Forum: Problem Solving
- Topic: Circle
- Replies: 5
- Views: 2308
Mixture
One kilogram of a certain coffee blend consists of x kilogram of type I coffee and y kilogram of type II coffee. The cost of the blend is C dollars per kilogram , where C = 6.5x + 8.5y. Is x <0.8 ?
1) y > 0.15
2). C >= 7.30
- by bia
Sun May 18, 2008 5:09 am- Forum: Data Sufficiency
- Topic: Mixture
- Replies: 4
- Views: 3744
Age
How many years did Dr.Jones live?
1) If Dr.Jones had become a doctor 10 years earlier than he did, he would have been a doctor for exactly 2/3 of his life.
2) if Dr.Jones had become a doctor 10 years later than he did, he would have been a doctor for exactly 1/3 of his life
- by bia
Sun May 18, 2008 1:34 am- Forum: Data Sufficiency
- Topic: Age
- Replies: 5
- Views: 3870
S : total value of stock fund
amount of money to invest in SA stocks = (48/100) x S
amount of money to invest in Argentina company = (48/100) x S x (12.5/100) = 42.10^6
==> S = 700 x 10^6
Answer is A
- by bia
Sat May 17, 2008 11:11 pm- Forum: Problem Solving
- Topic: percents....a whole different level....
- Replies: 1
- Views: 1262
It's not tough one. It only requires your patience and carefulness 1st day : t1 = t2 + 1; r1 = 2 + r2 2 days : d = 324m ; t = 17h t1 + t2 = 17 t1 = t2 + 1 ==> t1= 9h ; t2= 8h r1 = 2 + r2 ==> d1/9 = 2+d2/8 d1+d2 = 324 ==> d2 = 144 m So average speed of 2nd day = d2/t2 = 144/8 = 18 m/h Answer is D
- by bia
Sat May 17, 2008 10:58 pm- Forum: Problem Solving
- Topic: average speed ...freakin annoying
- Replies: 1
- Views: 1358