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14) Six machines working at the same rate constant rate complete a job in 12 days. How many additional machines working at same rate will be needed to complete the job in 8 days? a. 3 b. 6 c. 9 d. 12 e. 15 My approach : 12 days - 1 job - 6 machines 8 days - 1 job - how many machines = 8 * 6 /12 = 4...

by shibal

Sat Sep 04, 2010 6:33 am
Forum: Problem Solving
Topic: How many more machines..
Replies: 6
Views: 1767

rashmi.kaushal wrote:In correct answer choice - but that sounds awkward ?

Image
also whether or not is always wrong

by shibal

Sat Sep 04, 2010 5:11 am
Forum: Sentence Correction
Topic: Can you explain B & C
Replies: 4
Views: 1583

If n is a positive integer, what is the remainder when 3^8n+3 + 2 is divided by 5? IMO: 3 patterns for 3 squared is: 3,9,7,1..... so by plugging in # we can find the pattern. for n=1 we'll have 3^13. going back to pattern i just mentioned, u'll find out that the 13th pattern is 3. plug in 2; it'll ...

by shibal

Sat Sep 04, 2010 5:01 am
Forum: Problem Solving
Topic: integers
Replies: 4
Views: 1416

gmatrant wrote: The probability that a certain coin will fall heads up is 50%. What is the
probability that it falls heads up on three of six tosses?
(A)41/2^6
(B)35/2^6
(C)1/2^6
(D)21/2^5
(E)5/2^4

6C3/2^6 ==> 20/2^6 = 5/2^4 E

OA

by shibal

Sat Sep 04, 2010 4:32 am
Forum: Problem Solving
Topic: Doubts..
Replies: 3
Views: 1547

Which of the following lines is perpendicular to y=-2x+3 and has the same y-intercept as y=2x-3? a) y=-1/2x+3 b) y= 1/2x-3 c) y= 1/2x+3 d) y= 2x+3 e) y = 2x-3 IMO B to be perpendicular, the slope of the other line must be the opposite and negative, thus if the given slope is -2, the opposite and ne...

by shibal

Tue Aug 31, 2010 3:37 pm
Forum: Problem Solving
Topic: coordinate geometry
Replies: 4
Views: 1546

but by exponent rules (2^3)^2 be 2^(3*2)??? The question is (2^(4-1)^2)/(2^(3-2) Numerator = (2^(4-1)^2) = 2^3^2 3^2 = 9, so numerator reduces to 2^9 Now denominator = 2^(3-2) = 2^1 = 2 Therefore, 2^9/2 = 2^(9-1) = 2^8 We cannot write (2^3)^2 = 2^(3*2), as 2^3^2 = 2^(3^2) = 2^9 2^3^2 means 2 is a p...

by shibal

Sun Aug 29, 2010 3:59 pm
Forum: Problem Solving
Topic: help...
Replies: 5
Views: 1439

I just took an official CAT with a pretty good outcome... but I don't know why I got the FIRST freakin question wrong.... i did 75 times and still can't get to the right answer... (2^(4-1)^2)/(2^(3-2) OA: [spoiler]2^8[/spoiler] (2^(4-1)^2)/(2^(3-2) = (2^3^2)/(2^1) = (2^9)/2 = 2^(9-1) = 2^8 but by e...

by shibal

Sun Aug 29, 2010 3:08 pm
Forum: Problem Solving
Topic: help...
Replies: 5
Views: 1439

help...

I just took an official CAT with a pretty good outcome... but I don't know why I got the FIRST freakin question wrong.... i did 75 times and still can't get to the right answer...

(2^(4-1)^2)/(2^(3-2)

OA: [spoiler]2^8[/spoiler]

by shibal

Sun Aug 29, 2010 2:36 pm
Forum: Problem Solving
Topic: help...
Replies: 5
Views: 1439

C should be correct. It is mentioned in the last paragraph that - The five major food industries-meat processing, dairy (which includes both milk and cheese) and grain processing (which includes flour milling and feed processing)-doubled their output per worker, and two other industries realized at...

by shibal

Sat Aug 28, 2010 11:33 am
Forum: Reading Comprehension
Topic: knewton rc 1
Replies: 2
Views: 1384

thephoenix wrote:imo c

Total 3 digit numbers 900, 3 digit number with no 7 =8*9*9=648, P(at least one 7)=1-P(no 7)=1-648/900=252/900=7/25
i got that too, but counting each hundreds, tens and units digit.... how do u come up with 8*9*9?

by shibal

Sat Aug 28, 2010 6:22 am
Forum: Problem Solving
Topic: probability haunts
Replies: 15
Views: 2557

HI GUYS, you might help me with this question. A total of n trucks and cars are parked in a lot. If the number of cars is 1/4 the number of trucks, and 2/3 of the trucks are pickups, how many pcikups, in terms of n, are parked in the lot? I do already know that the answer is 8/15 n just go through ...

by shibal

Sat Aug 28, 2010 5:51 am
Forum: Problem Solving
Topic: Truck
Replies: 4
Views: 1717

intend on IMO is not correct....
given the options i'd go with B...... OA?

by shibal

Mon Aug 23, 2010 4:30 pm
Forum: Sentence Correction
Topic: Intending vs intent
Replies: 8
Views: 4405

they are not discussed directly, but you can see it here: "...Until recently, scientists debated whether females even have horns, and most scientific work has had to rely on DNA garnered from dung..."

is #2 D?

by shibal

Mon Aug 23, 2010 4:06 pm
Forum: Reading Comprehension
Topic: Rhino
Replies: 1
Views: 1957

IMO B

"...do not closely follow the classical rational model of first clarifying goals..." ==> A conventional model

"...Rather, in their day-by-day tactical maneuvers, these senior executives rely on what is vaguely termed..." ==> alternative introduced.

by shibal

Tue Aug 17, 2010 5:06 pm
Forum: Reading Comprehension
Topic: Management process
Replies: 6
Views: 2344

453.122 x 10 = 4531.22 453.122 x 10^3 = 453122 453.122 x 10^-2 = 4.53122 ???????????????? so when we have a negative exponent like this one, do we simply move the decimal to the left based on what the exponent is. so if the exponent is -2, do we go 2 places to the left or 3??? thanks to all when ex...

by shibal

Sat Aug 14, 2010 7:58 am
Forum: Problem Solving
Topic: very silly question
Replies: 4
Views: 1098