Search found 12 matches
Brilliant as always. I can see the error, Thank you. If I try solving this by rewriting the right side rather than the left side as a common base i.e. 5 ^12 --> 25^ 11 then n would have to be greater than 11 ? Your mistake is there. Arithmetic of powers do not work that way. 5^12 = 5*(5^11) NOT 25^1...
- by neeg
Sun Mar 31, 2013 5:27 pm- Forum: Problem Solving
- Topic: OG -106
- Replies: 6
- Views: 3057
OG -106
What is the smallest integer n for which 25^n > 5^12?
a)6
b)7
c)8
d)9
e)10
If I try solving this by rewriting the right side rather than the left side as a common base i.e. 5 ^12 --> 25^ 11 then n would have to be greater than 11 ?
- by neeg
Sat Mar 30, 2013 11:43 am- Forum: Problem Solving
- Topic: OG -106
- Replies: 6
- Views: 3057
Roderick mixes a martini that has a volume of n ounces that is 40% vermouth and 60% gin by volume. He wants to change this so that it is 25% vermouth by volume. How many ounces of gin must he add? Let us assume n = 100 Hence, there is 40 ounce of vermouth and 60 ounce of gin. We have to make the ra...
- by neeg
Fri Mar 08, 2013 6:19 pm- Forum: Problem Solving
- Topic: Algebra
- Replies: 8
- Views: 3273
Thanks - I follow the different appraoches to solving for x provided in the link.Anurag@Gurome wrote:Refer the following posts...
http://www.beatthegmat.com/2-x-2-x-2-3- ... tml#577790
http://www.beatthegmat.com/2-x-2-x-2-3- ... tml#577789
Neeg
- by neeg
Wed Mar 06, 2013 9:41 am- Forum: Problem Solving
- Topic: What is value of x?
- Replies: 10
- Views: 2606
I'm unclear about the very fist step of factoring 2^(x-2)[2^2 - 1] = 3(2^13)....how is 2^(x-2)a common factor? Good question. To answer this, let's examine some analogous factoring cases: k^5 - k^3 = k^3(k^2 - 1) m^19 - m^15 = m^15(m^4 - 1) Or how about: w^x + x^(x+5) = w^x(1 + w^5) Notice that, ea...
- by neeg
Wed Mar 06, 2013 9:39 am- Forum: Problem Solving
- Topic: What is value of x?
- Replies: 10
- Views: 2606
applied problems
An object thrown directly upward is at a height of h feet after t seconds, where h = -16(t-3)^2 + 150. At what height, in feet, is the object 2seconds after it reaches its maximuh height? a)6 b)86 c)134 d)150 e)166 The solution goest on to explain that the minimum value of (t-3)^2 occurs when t = 3 ...
- by neeg
Tue Mar 05, 2013 5:37 pm- Forum: Problem Solving
- Topic: applied problems
- Replies: 1
- Views: 921
I'm unclear about the very fist step of factoring
2^(x-2)[2^2 - 1] = 3(2^13)....how is 2^(x-2)a common factor?
This requires some factoring.
2^x - 2^(x-2) = 3(2^13)
2^(x-2)[2^2 - 1] = 3(2^13)
2^(x-2)[3] = 3(2^13)
So, 2^(x-2)= 2^13
x-2 = 13
[spoiler]x = 15[/spoiler]
- by neeg
Tue Mar 05, 2013 5:17 pm- Forum: Problem Solving
- Topic: What is value of x?
- Replies: 10
- Views: 2606
OG - Q.137
At a regular hourly rate, Don had estimated that labor cost of a repair job as $336 and he was paid that amount. However, the job took 4hrs longer that he had estimated and, consequently, he earned $2 per hour less than his regular hourly rate, What was the time Don had estimated for the job, in hou...
- by neeg
Tue Mar 05, 2013 5:00 pm- Forum: Problem Solving
- Topic: OG - Q.137
- Replies: 5
- Views: 1583
Yes, it was an error in typing the statements. Statement (2) should have read as sq rt 10d is NOT an integer. Thanks for the solution as I understand the solution now.
- by neeg
Tue Mar 05, 2013 3:43 pm- Forum: Problem Solving
- Topic: DS - Question
- Replies: 2
- Views: 945
DS - Question
If d is a positive integer, is sq.rt. d an integer?
(1)Sq.rt.9d is an integer
(2)Sq.rt.10d is an integer
- by neeg
Sun Mar 03, 2013 7:14 am- Forum: Problem Solving
- Topic: DS - Question
- Replies: 2
- Views: 945
Sequences - DS
In the infinite sequence S, each term Sn after S2 is equal to the sum of the two terms Sn-1 and Sn-2. If S1 is 4, what is the value uf S2?
(1) S3 = 7
(2) S4 = 10[/quote][/list]
- by neeg
Thu Feb 28, 2013 6:57 am- Forum: Data Sufficiency
- Topic: Sequences - DS
- Replies: 2
- Views: 1300
propotions question
How many liters of water must be evaporated from 50 litres of a 3 percent sugar solution to get a 5 percent solution?
Ans choices
(A)2 (B)4 (C)6 (D)10 (E)20
- by neeg
Tue Feb 26, 2013 8:19 am- Forum: Problem Solving
- Topic: propotions question
- Replies: 2
- Views: 3729