## 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:
**1216**

##### 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:
**1458**

- by kaf

Tue Mar 31, 2009 2:45 pm- Forum: Problem Solving
- Topic: Integers
- Replies:
**2** - Views:
**1047**

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:
**1861**

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:
**1773**

- by kaf

Thu Mar 26, 2009 9:23 am- Forum: Problem Solving
- Topic: Net gain or loss
- Replies:
**3** - Views:
**3447**

- by kaf

Thu Mar 26, 2009 9:10 am- Forum: Problem Solving
- Topic: percentage change
- Replies:
**7** - Views:
**1773**

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:
**1773**

##### 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:
**816**

##### 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:
**3447**

##### 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:
**1773**

##### 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:
**735**

##### 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:
**825**

- by kaf

Tue Mar 24, 2009 3:03 am- Forum: Problem Solving
- Topic: Inequalities
- Replies:
**5** - Views:
**973**

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:
**973**