Search found 5 matches
For questions like this, I think it makes sense not to solve for x. from here we have: 4^4x = 1600 (Equation 1) Now lets take a ratio of what we have vs. whats required: 4^4x / [4^(x–1)]^2 = 4 ^ (2x + 2) (Ratio 1) From Equation 1, 4^2x = 40 Thus 4^(2x+2) = 40 * 16 = 640 So what we need now is 1600/6...
- by gm800
Tue May 08, 2007 12:48 pm- Forum: Problem Solving
- Topic: exponents
- Replies: 5
- Views: 2144
Lets say that the cost of each apple was x. The total cost of apples = 5*x. According to Statement (1) one pound of Pears costs 0.50c more than apples. Lets say the same amount of money can buy p pears. 5*x = p*(x+0.5) there is insufficient information here to solve this. According to statement (2),...
- by gm800
Wed May 02, 2007 4:18 pm- Forum: Data Sufficiency
- Topic: DS from Gmat prep
- Replies: 3
- Views: 4647
- by gm800
Wed May 02, 2007 2:21 pm- Forum: Data Sufficiency
- Topic: DS from Gmat prep
- Replies: 3
- Views: 4647
x + 4 = 1, so x = -3
y + 4 = -5 so y = -9
z + 4 = m (Remember this)
e + x = 7, since x = 3, e = 10
e + y = n, since y = -9, e = 10, n = 1
z + e = 10, since e = 10, z = 0.
remember z + 4 = m, so m = 4
So m + n = 4 + 1 = 5.
- by gm800
Thu Apr 26, 2007 8:44 pm- Forum: Problem Solving
- Topic: GMATPrep question
- Replies: 3
- Views: 2052
Number of ways a 3 people committee can be formed from 8 people = 8c3
Number of committes in which a couple will serve together = 4 * 6c1 (i.e. 4 couples * 6 ways to select the 3rd person) = 24
So 8c3 - 24 = 32.
- by gm800
Thu Apr 26, 2007 8:39 pm- Forum: Problem Solving
- Topic: GMATPrep question
- Replies: 6
- Views: 2104