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: 1256

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: 1496

Please how did you arrive at this

(x+1)(y+1) = 15
=> x=2, y=4.

thanks

by kaf

Tue Mar 31, 2009 2:45 pm
Forum: Problem Solving
Topic: Integers
Replies: 2
Views: 1084

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: 1927

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: 1820

DanaJ

Please if you could explain step by step it will be very much appreciated

thanks

by kaf

Thu Mar 26, 2009 9:23 am
Forum: Problem Solving
Topic: Net gain or loss
Replies: 3
Views: 3489

Sorry about this

there is the figure 144 so i have edited the question

thanks

by kaf

Thu Mar 26, 2009 9:10 am
Forum: Problem Solving
Topic: percentage change
Replies: 7
Views: 1820

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: 1820

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: 859

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: 3489

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: 1820

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: 768

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: 867

I think i get it now cos 1^2 = 1 anyway so it works it

thanks a lot

by kaf

Tue Mar 24, 2009 3:03 am
Forum: Problem Solving
Topic: Inequalities
Replies: 5
Views: 1014

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: 1014