Search found 6 matches
Interior angles of a quadrilateral
I dont understand this one... please help! Is the measure of one of the interior angles of quadrilateral ABCD equal to 60 degrees? (1) Two of the interior angles of ABCD are right angles (2) The degree measure of angle ABC is twice the degree measure of angle BCD My reasoning: (1) is not sufficient ...
- by rafodr
Wed Sep 16, 2009 9:06 am- Forum: Data Sufficiency
- Topic: Interior angles of a quadrilateral
- Replies: 1
- Views: 2968
Multiple of 8
Please help with this one...
If x and y are positive integers, is xy a multiple of 8?
(1) The greatest common divisor of x and y is 10
(2) The least common multiple of x and y is 100
I thought that A was the answer, but it says that the answer is C
- by rafodr
Wed Sep 16, 2009 8:50 am- Forum: Data Sufficiency
- Topic: Multiple of 8
- Replies: 2
- Views: 1684
For your second problem
You have to equalize the hourly wages of John and Mary after Mary gives John the y dollars, so:
John Mary
(x + y)/10 = (x - y)/(10 - 2)
The amount that John is paid in advance is x, so find x in terms of y
8x + 8y = 10x - 10y
x = 9y
- by rafodr
Wed Sep 09, 2009 1:52 pm- Forum: Problem Solving
- Topic: Having Problems with these OG Questions...
- Replies: 2
- Views: 1068
Answer to problem 1
Lets call I = Income SV = Amount saved this year SP = Amount spent this year The question, in other words, is: "Find SV/I in order to SV*(1+r)=1/2*SP" 1. You know that I = SV + SP 2. From (1) -> SP = I - SV 3. Plug (2) into the eq. SV*(1+r)=1/2*SP, and find SV 4. You'll find that SV = I/(3...
- by rafodr
Wed Sep 09, 2009 1:47 pm- Forum: Problem Solving
- Topic: Having Problems with these OG Questions...
- Replies: 2
- Views: 1068
COMBINATORICS
Q: How many different positive integers having six digits are there, where exactly one of the digits is a 3, exactly two of the digits are a 4, exactly one of the digits is a 5, and each of the other two digits is a 7 or an 8? A)360 B)720 C)840 D)1080 E)1440 Please, I would appreciate some help with...
- by rafodr
Wed Sep 09, 2009 1:30 pm- Forum: Problem Solving
- Topic: COMBINATORICS
- Replies: 2
- Views: 1153
Please HELP! Probability & Counting methods
Q: There are 8 disks in a container that are numbered 23, 24, 25, 26, 28, 29, 30, and 31. 4 disks are randomly removed from the container, one after the other, without replacement. Then a list of 5 numbers containing the 4 numbers on the disks selected, together with the number 27 will be made. What...
- by rafodr
Wed Sep 09, 2009 11:49 am- Forum: Problem Solving
- Topic: Please HELP! Probability & Counting methods
- Replies: 1
- Views: 1178