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Can someone please solve this problem for me? 3 K 2 8 M 3 The arithmetic mean of the list of numbers above is 4. If K and M are integers, and K ≠M, what is the median of the list? a) 2 b) 2.5 c) 3 d) 3.5 e) 4 The answer is C. median is the middle number in odd set, or the average of two middle n...
- by shahdevine
Mon Jun 21, 2010 1:14 pm- Forum: Problem Solving
- Topic: Arithmetic mean problem
- Replies: 8
- Views: 7987
Hi, Can anyone help solving this integer question ? If k is an integer, and (35^2-1)/k is an integer, then k could be each of the following, EXCEPT (A) 8 (B) 9 (C) 12 (D) 16 (E) 17 Thanks, Sidon I would look at (35^2-1) as difference of squares and simplify --> a^2-b^2=(a+b)(a-b) --> (35-1)(35+1)=3...
- by shahdevine
Tue Apr 20, 2010 12:11 pm- Forum: GMAT Math
- Topic: integer question
- Replies: 6
- Views: 1794
s+t is even
let s and t be odd integers. is (s-t)/2 even?
1) s+t is even
2) s-t is even
oa after some discussion.
thnkx
- by shahdevine
Tue Sep 01, 2009 4:20 pm- Forum: Data Sufficiency
- Topic: s+t is even
- Replies: 3
- Views: 1483
to halve or not to halve
Each day after an item is lost the probability of finding that item is halved. If 3 days after a certain item is lost the probability 1/64, what was the initial probability of finding the item?
a)1/32
b)1/8
c)1/4
d)1/2
e)1
oa is d...plz show set up! thx
- by shahdevine
Tue Sep 01, 2009 4:18 pm- Forum: Problem Solving
- Topic: to halve or not to halve
- Replies: 1
- Views: 1176
v,w,x,y,z
Runners V, W, X, Y and Z are competing in the Bayville local triathlon. How many different ways are there for X to complete the race ahead of Y? (A) 5 (B) 10 (C) 30 (D) 60 (E) 120 this one was tough for me...here was my thinking the only ways for x to complete race ahead of y 1*2*3*y*x=6 1*2*y*3*x=6...
- by shahdevine
Tue Sep 01, 2009 4:14 pm- Forum: Data Sufficiency
- Topic: v,w,x,y,z
- Replies: 3
- Views: 1556
probability/combinatorics
There are 3 dimes and 3 quarters in a coin purse. If 4 coins are chosen at random from the purse, what is the probability of getting more than 65 cents? a)1/5 b)2/5 c)1/2 d)3/5 e)4/5 OA after some discussion 65 cents requires some combination of QQQQ, QQQD,QQDD, but I get stuck with these probabilit...
- by shahdevine
Tue Sep 01, 2009 4:05 pm- Forum: Data Sufficiency
- Topic: probability/combinatorics
- Replies: 2
- Views: 1219
3 venn
There are 68 children in the cafeteria of a school and all of the children have something for lunch. Thirty-four of the children brought lunches from home, 23 of the children bought a drink from the cafeteria beverage machine, and 32 of the children bought fruit in the cafeteria. If 18 children did ...
- by shahdevine
Tue Sep 01, 2009 4:00 pm- Forum: Data Sufficiency
- Topic: 3 venn
- Replies: 1
- Views: 1227
faster way
What is the greatest value of n such that 7^n is a factor of 50! ?
a)8
b)7
c)6
d)3
e)2
oa after discussion. is there a fast way to do these types of problems?
- by shahdevine
Mon Aug 31, 2009 12:23 pm- Forum: Problem Solving
- Topic: faster way
- Replies: 4
- Views: 1311
range for t
Which of the following expresses the range of possible values for t if -6 < |5t - 8| < 1?
a) 2/5<t<14/5
b)2/5<t<9/5
c)7/5<t<14/5
d)7/5<t<9/5
e)9/5<t<14/5
oa after some discussion.
i chose c...why can't it be c. plz explain
- by shahdevine
Mon Aug 31, 2009 12:15 pm- Forum: Problem Solving
- Topic: range for t
- Replies: 1
- Views: 1023
IMO B 1 is insufficient because m could be 1,2,3,4 or 5 2 is sufficient because only if m=1 can the remainder of any division be even ... i.e Any number divided by 1 has a reminder of 0 which is considered an even number. so the bigger takeaway is, are all remainders of improper fractions odd? Are ...
- by shahdevine
Sun Aug 30, 2009 8:27 am- Forum: Problem Solving
- Topic: positive integer m
- Replies: 9
- Views: 1877
each quarter
At the end of each quarter–year the value of the stock of a certain company is x times more expensive. If at the start of first quarter of 1980 the price of the stock was $3 and at the end of the last quarter of 1985 the price of the stock was $9, what is x?
will post oa after some discussion.
- by shahdevine
Sat Aug 29, 2009 8:22 pm- Forum: Problem Solving
- Topic: each quarter
- Replies: 8
- Views: 1571
- by shahdevine
Sat Aug 29, 2009 8:19 pm- Forum: Problem Solving
- Topic: 3 digits
- Replies: 5
- Views: 1452
Total 3-digit numbers: 9 * 10 * 10 = 900 3-digit numbers that satisfy the problem: 9 * 8 * 1 = 72 72 / 900 = 2/25 thx...here are some stupid questions: 1) why is total of 3 digit numbers 9x10x10? is it because you have to discount the possibility of farthest left digit column having zeroes? 2) how ...
- by shahdevine
Sat Aug 29, 2009 8:03 pm- Forum: Problem Solving
- Topic: 3 digits
- Replies: 5
- Views: 1452
Re: GMAT in 10 days-- 8th Sep
Well, my first post! I have prepared and referred to the Forum since last 1-1.5 months. I am taking an off on Sep3,4 and 5,6,7 are already off. So out of the next 10 days I am pretty much off for 7 days. I have been scoring from 670-700 in my last few tests. Analysed and focussed on my sentence cor...
- by shahdevine
Sat Aug 29, 2009 7:41 pm- Forum: GMAT Strategy
- Topic: GMAT in 10 days-- 8th Sep
- Replies: 4
- Views: 1385
positive integer m
What is the value of positive integer m?
(1) The remainder when any integer is divided by m is less than 5.
(2) The remainder when any integer is divided by m is an even number.
OA after some discussion.
- by shahdevine
Sat Aug 29, 2009 7:34 pm- Forum: Problem Solving
- Topic: positive integer m
- Replies: 9
- Views: 1877