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I used this method to solve the problem. but the result is different with the previous post could anyone tell me what is wrong? let "t" be the time required by the first 25 men . we know that 25 do the job in 20 days. their total production is 20*25 in the same way for the first part of jo...

by adam15

Sun May 09, 2010 3:07 pm
Forum: Problem Solving
Topic: 25 men reap a field in 20 days
Replies: 7
Views: 19774

Hy Stuart, you totally right. I was think about my solution, and it seems weird. and I tried backsolving here is my backsolution and by the way thank you again or you solution. let's start with the first choice. between parethensis the number of students left 60-3(28)=57-12(15)=45-20 (5)=25=5*5 and ...

by adam15

Sun Dec 06, 2009 5:28 pm
Forum: Problem Solving
Topic: How many books we could borrow
Replies: 3
Views: 1366

How many books we could borrow

In class of 30 students, 2 did not borrow any books from the liberary, 12 students each borrowed 1 book, 10 students each borrowed 2 books, and the rest of the students each borrowed at least 3 books. if the average ( arithemtic mean) number of books borrowed per student was 2, what is the maximum n...

by adam15

Sun Dec 06, 2009 2:47 pm
Forum: Problem Solving
Topic: How many books we could borrow
Replies: 3
Views: 1366

positive integer

I guess, some already posted the solution for this DS, but I could not find thanks for the answer?
if K is apositve integer, is K the square of an integer?
1-K is divisible by 4
2-K is divisible by exactly four different prime numbers

by adam15

Sun Dec 06, 2009 1:56 pm
Forum: Data Sufficiency
Topic: positive integer
Replies: 0
Views: 1030

bathtub

in reservor two tube leaks, the first tube can fill an empty bucket in x hours, and the second tube alone can fill the same bucket in y hours, where x<y, if both tubes began leaking at the same time into the empty bucket at their respective constant rates and consequently it took t hours to fill the...

by adam15

Sun Dec 06, 2009 1:51 pm
Forum: Problem Solving
Topic: bathtub
Replies: 4
Views: 1485

Thank you Stuart for your remark.

by adam15

Sat Dec 05, 2009 4:09 pm
Forum: Problem Solving
Topic: Nice challenge
Replies: 5
Views: 2221

board of director

each of 3 charities in Ginglo Kiru has 8 persons serving on its board of directors. if exactly 4 persons serve on 3 board each and each pair of charities has 5 persons in common on their boards of directors, then how many distinct persons serve on one or more boards of directors?

8
13
16
24
27

by adam15

Sat Dec 05, 2009 3:35 pm
Forum: Problem Solving
Topic: board of director
Replies: 2
Views: 1485

Hi, Here is are 2 good tutorials on Mixtures. The link below has a nice tutorial by Suresh Bala (whom we already in this forum coz of his 780+ problems link and average calculation tutorials) http://gmat.learnhub.com/lesson/9301-gmat-alligation-class This is a chapter on Alligation from a book whic...

by adam15

Sat Dec 05, 2009 9:44 am
Forum: Problem Solving
Topic: Tutorials on Mixtures
Replies: 1
Views: 4633

this is the right answer thank you.
I used backsolving .
by the writing the second equation.
as follow:
A=(B-70)/3
an check for the answer choice and check for a multiple of 3

by adam15

Sat Dec 05, 2009 9:37 am
Forum: Problem Solving
Topic: Nice challenge
Replies: 5
Views: 2221

Nice challenge

Archie, Betty and Coach bought a radio. Archie paid the least amount of money, Coach paid twice as much as Archie, and Betty paid the most. Archie paid seventy dollars less than the difference between what Betty and Coach paid. If Archie had paid twice as much as he did pay, Betty and Coach would ha...

by adam15

Fri Dec 04, 2009 8:11 pm
Forum: Problem Solving
Topic: Nice challenge
Replies: 5
Views: 2221

C: number of cans in every can there is 4c of concerate and water thus 12*4c=200*6 after computation you find c= 25. this problem can be viewed in the following way. you have 4 workers can accomplish a task in 12 days. we 6 workers can accomplish a task in 200 days. the question how many more days t...

by adam15

Thu Dec 03, 2009 10:46 pm
Forum: Problem Solving
Topic: Can't figure this one out...
Replies: 11
Views: 7198

[spoiler]1-B
2-D
3-C
4-B[/spoiler]

by adam15

Wed Dec 02, 2009 10:20 pm
Forum: Sentence Correction
Topic: 4 questions...
Replies: 16
Views: 5853

I actual you need to factorize the 9^21(1+9+81)=91*9^21

by adam15

Mon Nov 30, 2009 6:50 pm
Forum: Problem Solving
Topic: Exponents
Replies: 3
Views: 1451

I was wondering if the sector area is another circle with different radius, do still getting the same result. A is sufficient, because I consider the sector as a unite circle.and i am getting (6/sqr(2))*2.

by adam15

Sun Nov 29, 2009 10:51 am
Forum: Data Sufficiency
Topic: Area Sector
Replies: 5
Views: 3813

the answer is C.
Would you please tell me where you bought this GMAT practice.

by adam15

Sun Nov 29, 2009 10:33 am
Forum: Data Sufficiency
Topic: Weighted Average
Replies: 7
Views: 1911