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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
- 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
- by adam15
Wed Dec 02, 2009 10:20 pm- Forum: Sentence Correction
- Topic: 4 questions...
- Replies: 16
- Views: 5853
- 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
- by adam15
Sun Nov 29, 2009 10:33 am- Forum: Data Sufficiency
- Topic: Weighted Average
- Replies: 7
- Views: 1911