Search found 43 matches
angle in a clock
if a clock points to 4:40, what is the angle (minor) between the hour and minute handle?
- by r_walid
Mon Nov 16, 2009 1:31 pm- Forum: Problem Solving
- Topic: angle in a clock
- Replies: 6
- Views: 8427
probability problem with condition
out of 7 models, 5 will be selected for a photo. if the 5 models are to stand in a line from shortest to tallest and if all are of different heights, and if the fourth and sixth tallest models cannot sit side by side, how many different arrangements of 5 models are possible? 6 11 17 72 210 Please ex...
- by r_walid
Sun Nov 15, 2009 12:32 pm- Forum: Problem Solving
- Topic: probability problem with condition
- Replies: 4
- Views: 1590
3rd side of a triangle
if 2 sides of any triangle are known, what is the minimum and max size of the third?
- by r_walid
Fri Nov 13, 2009 2:18 am- Forum: GMAT Math
- Topic: 3rd side of a triangle
- Replies: 3
- Views: 1646
2 different ways to solve a probability problem
I recently posted the following question: There are 5 red balls and 10 blue balls. if one is to pick 5 balls, What is the probability of picking 2 red and 3 blue? The answer I recieved which I am convinced of is the following: Probability = no. of desired outcomes / total no. of outcomes. no.of desi...
- by r_walid
Fri Nov 13, 2009 1:50 am- Forum: Problem Solving
- Topic: 2 different ways to solve a probability problem
- Replies: 1
- Views: 11487
probability that not all balls are orange?
Say I have a basket with 5 blue and 6 orange balls, I am to pick 4 balls at random. what is the probability of not picking all 4 balls as orange? please explain with detail your reasoning. Also, I am wondering, in this case, what is the general formula of this problem? i.e, the sum of different prob...
- by r_walid
Fri Nov 13, 2009 1:17 am- Forum: GMAT Math
- Topic: probability that not all balls are orange?
- Replies: 3
- Views: 4895
Probability of picking 2 red balls and 3 blue?
There are 5 red balls and 10 blue balls.
if one is to pick 5 balls, What is the probability of picking 2 red and 3 blue?
please explain your reasoning.
- by r_walid
Wed Nov 11, 2009 3:40 pm- Forum: Problem Solving
- Topic: Probability of picking 2 red balls and 3 blue?
- Replies: 3
- Views: 4195
How to solve this one?
Data sufficiency question on the following:
what is the value of n?
1) n(n+2) = 15
2) (n+2)^n=125
please explain your process.
- by r_walid
Thu Nov 05, 2009 11:46 am- Forum: Data Sufficiency
- Topic: How to solve this one?
- Replies: 3
- Views: 1492
DS on Solving addition table with unknown
The following addition table is given
---x----y---z
d---()---()---m
e---()---n---()
f---()---()---()
what is the value of m+n
1) d+y = -3
2) e+z = 12
Please let me know how you come with the conclusion
- by r_walid
Thu Nov 05, 2009 10:37 am- Forum: Data Sufficiency
- Topic: DS on Solving addition table with unknown
- Replies: 3
- Views: 1163
How to solve this one quickly?
which of the following has a terminating decimal? 10/189 5/196 16/225 25/144 39/128 The answer is easy when you have enough time. I'm posting this not to ask for the answer but to ask what or how can i solve this in 2 minutes without a calculator? there has to be a short way for doing so and I need ...
- by r_walid
Thu Nov 05, 2009 10:04 am- Forum: Problem Solving
- Topic: How to solve this one quickly?
- Replies: 5
- Views: 1586
DS on equations
Data sufficiency question on the following:
what is the value of n?
1) n(n+2) = 15
2) (n+2)^2=125
please explain your process.
- by r_walid
Thu Nov 05, 2009 9:56 am- Forum: Data Sufficiency
- Topic: DS on equations
- Replies: 5
- Views: 1714
Ratio of Radio production
A company produces two types of radio: basic and deluxe. of the stereos produced, 2/3 are basc and the rest delux. if it takes 7/5 as many hours to produce a deluxe as it does to produce a basic, then what is the ratio of the number of hours it took to produce deluxe radio over the total hours it to...
- by r_walid
Thu Nov 05, 2009 9:37 am- Forum: Problem Solving
- Topic: Ratio of Radio production
- Replies: 2
- Views: 1400
Answer is 4. I don't see a shorter way to solve this then by figuring out like terms, and then rationalizing the denominator. Step 1: Look at what is on the inside. 2*sqrt(63) can be rewritten as 6*sqrt(7), and when you add that to 2/(8+3*sqrt(7)), you need to have a common denominator or 8+3*sqrt(...
- by r_walid
Wed Nov 04, 2009 11:08 am- Forum: GMAT Math
- Topic: Complicated formula
- Replies: 2
- Views: 1554
Complicated formula
what is the following equal to?
sqrt [ 2xsqrt(63) + 2/(8 + 3xsqrt(7) ) ]
the answer isn't as important as to find a way to quickly solve this. I know there is a trick, but i can't seem to find it.
thanks
- by r_walid
Wed Nov 04, 2009 10:14 am- Forum: GMAT Math
- Topic: Complicated formula
- Replies: 2
- Views: 1554
HOw many ways to assign 3 employees in 2 offices
a certain co. assigns its employess in such a way that some offices can be empty and also more than one employee can be assigned to an office.
how many ways can a compan assign 3 employees to 2 different offices?
Please detail your explanation
- by r_walid
Wed Nov 04, 2009 9:45 am- Forum: Problem Solving
- Topic: HOw many ways to assign 3 employees in 2 offices
- Replies: 1
- Views: 920
DS on inequalities
IF material A cost 3$/kg and B cost 5$/kg.
If 10 kg of material K conssit of x kg of A and y kg of B, is x>y?
1- y>4
2- the cost of 10kg of K is less than $40.
- by r_walid
Tue Nov 03, 2009 8:22 pm- Forum: Data Sufficiency
- Topic: DS on inequalities
- Replies: 9
- Views: 1993