Search found 53 matches
We know that Average Speed (AS) = Total Distance / Total Time. We also know that AS = 2(S1 * S2) / S1 + S2 where S1 is the speed for the first half of the trip and S2 is the speed for the second half of the trip We wont to attain an AS = 60mph for the entire 40 mile trip. therefore 60 = 2(50 * S2) /...
- by kaf
Wed Apr 01, 2009 4:28 pm- Forum: Problem Solving
- Topic: PS
- Replies: 2
- Views: 1474
PS - Correct amount
Can someone please solve and explain this question to me A cashier mentally reversed the digits of one customers correct amount of change and thus gave the customer an incorrect amount of change. If the cash register contained 45 cents more than it should have as a result of this error, which of the...
- by kaf
Wed Apr 01, 2009 3:48 pm- Forum: Problem Solving
- Topic: PS - Correct amount
- Replies: 2
- Views: 1716
- by kaf
Tue Mar 31, 2009 2:45 pm- Forum: Problem Solving
- Topic: Integers
- Replies: 2
- Views: 1316
yeah, you shouldn't need a formula. if anything, you should be able to immediately IDENTIFY THE PARTS OF THE VENN DIAGRAM that correspond to each of these possibilities. check out this diagram for reference: http://math.sduhsd.net:8080/webMathematica/webMathFiles/VennDiagram3Sets.jsp (1) this seems...
- by kaf
Tue Mar 31, 2009 4:56 am- Forum: Problem Solving
- Topic: Set theory .. Request a summary of different approaches.
- Replies: 8
- Views: 2303
1985 => 45% of 60 =27 1987 => 25% of 144=37 Total Increase between 1998-1987=36-27=9 %Increase=9/27=1/3=33.33% chetanojha thanks a lot for the solution but i think there are a few typo errors so i have corrected it below 1985 => 45% of 60 =27 1987 => 25% of 144=36 Total Increase between 1985-1987=3...
- by kaf
Sat Mar 28, 2009 4:28 pm- Forum: Problem Solving
- Topic: percentage change
- Replies: 7
- Views: 2111
- by kaf
Thu Mar 26, 2009 9:23 am- Forum: Problem Solving
- Topic: Net gain or loss
- Replies: 3
- Views: 3753
- by kaf
Thu Mar 26, 2009 9:10 am- Forum: Problem Solving
- Topic: percentage change
- Replies: 7
- Views: 2111
Its percentage increase. I saw this question in the old GMAT Powerprep
and the OA they gave there was D. 33/1/3
- by kaf
Thu Mar 26, 2009 6:17 am- Forum: Problem Solving
- Topic: percentage change
- Replies: 7
- Views: 2111
3x^2
Can someone please solve this solution
If x != 2, then 3x^2(x-2) - x + 2 / x-2 =
A. 3x^2 - x + 2
B. 3x^2 + 1
C. 3x^2
D. 3x^2 - 1
3x^2 - 2
note != means not equall to
thanks
- by kaf
Thu Mar 26, 2009 6:00 am- Forum: Problem Solving
- Topic: 3x^2
- Replies: 2
- Views: 1092
Net gain or loss
Can you please help in explaining the solution to this problem Ms. Adams sold two properties, X and Y, for $30,000 each. She sold property X for 20% more than she paid for it and sold property Y for 20% less than she paid for it. If expenses are disregarded, what was her total net gain or loss, if a...
- by kaf
Thu Mar 26, 2009 5:53 am- Forum: Problem Solving
- Topic: Net gain or loss
- Replies: 3
- Views: 3753
percentage change
Can someone please explain the solution to this problem for me In 1985, 45% of a document storage facility's 60 customers were banks, and in 1987, 25% of its 144 customers were banks. What was the percent increase from 1985 to 1987 in the number of bank customers the facility had? A. 10.7% B. 20% C....
- by kaf
Thu Mar 26, 2009 5:27 am- Forum: Problem Solving
- Topic: percentage change
- Replies: 7
- Views: 2111
Arithmetic mean
Can some please help in explaining the solution to this problem
If x+ y = 8z, then which of the following represents the average
(arithmetic mean) of x,y, and z, in terms of z?
A. 2z + 1
B. 3z
C. 5z
D. z/3
E. 3z/2
thanks
- by kaf
Thu Mar 26, 2009 2:38 am- Forum: Problem Solving
- Topic: Arithmetic mean
- Replies: 1
- Views: 960
OG Q194
Please i would like someone to explain to me how this works.I found this question in OG
What is the units digit of (13)^4(17)^2(29)^3
I saw the explanation in OG but i would to find out if someone has
an alternative for solving this question quicker
thanks
- by kaf
Tue Mar 24, 2009 9:32 am- Forum: Problem Solving
- Topic: OG Q194
- Replies: 1
- Views: 1048
- by kaf
Tue Mar 24, 2009 3:03 am- Forum: Problem Solving
- Topic: Inequalities
- Replies: 5
- Views: 1263
nitya34
I still dont get how 1-x^2 =(1)^2 - (x)^2
because i am thinking ^2 affects only x and not 1
thanks
- by kaf
Tue Mar 24, 2009 1:48 am- Forum: Problem Solving
- Topic: Inequalities
- Replies: 5
- Views: 1263