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Need help to solve these maths from GMAT Prep

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Manager
Manager
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Status: Still not there yet!!!
Joined: 11 Jan 2011
Posts: 60
Schools: Waaayyy....in the future - Booth!!
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Need help to solve these maths from GMAT Prep [#permalink] New post 10 Feb 2011, 15:08
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From a bag containing 12 identical Blue balls, y identical Yellow balls and no other balls, one ball will be removed at random.If the probability is less than 2/5 that the removed ball will be Blue, what is the least no of Yellow ball that must be in the bag?

For which of the following function f is f(x)=f(1-x) for all x?
A f(x)=1-x
B f(x)=1-x^2
C f(x)=x^2-(1-x)^2
D f(x)=x^2(1-x)^2
E f(x)=x/(1-x)^2

Did it take P more than 2 hrs to walk at a distance of 10 miles along a certain trail?(1mile=1.6kil)
(1) P walked this distance at an average rate of less than 6.4 kil per hr.
(2) On average it took P more than 9 min per kil to walk the distance.

Circular gear P and Q start rotating at the same time at constant speeds.Gear P makes 10 revolution per min and gear Q makes 40 revolution per min.How many seconds after the gears start rotating will gear Q have made exactly 6 more revolution than gear P?

I have less than 5 days left for the exam. I really need an easy method to understand and do these problems.
Thanks.
Manager
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Posts: 168
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Re: Need help to solve these maths from GMAT Prep [#permalink] New post 11 Feb 2011, 05:57
IMO they key for solving problems is understanding.

The solutions are out there if you search on Google, but we can help you better if you tell us how you are calculating and where you get stuck.
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12/2010 GMATPrep 1 620 (Q34/V41)
01/2011 GMATPrep 2 640 (Q42/V36)
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02/2011 MGMAT CAT 1 650 (Q46/V32)
02/2011 MGMAT CAT 2 680 (Q46/V36)
02/2011 MGMAT CAT 3 710 (Q45/V41)

Manager
Manager
User avatar
Status: Still not there yet!!!
Joined: 11 Jan 2011
Posts: 60
Schools: Waaayyy....in the future - Booth!!
Followers: 2

Kudos [?]: 6 [0], given: 14

Re: Need help to solve these maths from GMAT Prep [#permalink] New post 11 Feb 2011, 08:56
I did not understand the function math at all.

I am bad with probability math so couldn't understand how to solve it.I could solve easy probability and combination problems.But here the mention of less than kind of confused me i think.

In the distance rate problem both the statements kind of seemed the same to me.

And I did not understand the circular gear problem at all.

When I see some maths in this forum I think to myself, this looks hard!!But if I really try I could solve some and the ones I cant solve, when I see the solution I feel like saying-that was easy,why didn't I get it!!I know most of the basic concepts but at 1st glance and within 2 minutes ,its hard for me to figure out how to solve it.I am quiet weak at probability maths, and if they even just word an easy question in a tricky way, I get lost!!!

These are GMAT prep questions and I know the answers but I have no idea how they got to those answers.And I thought this forum is the best place to get to know and learn how to solve such problems.

(Pleeeeeeeease help!!!!) :(
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Re: Need help to solve these maths from GMAT Prep [#permalink] New post 11 Feb 2011, 09:39
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msneemo wrote:
For which of the following function f is f(x)=f(1-x) for all x?
A f(x)=1-x
B f(x)=1-x^2
C f(x)=x^2-(1-x)^2
D f(x)=x^2(1-x)^2
E f(x)=x/(1-x)^2


As far as functions go if f(x) = 1 - x, f(1-x)=1-(1-x)= x Thus, f(x) not equal to f(1-x)

So what we do is, to get f(1-x), we substitute x with (1-x) in f(x)

Try solving it using this hint! If not possible... feel free to buzz me :)
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Re: Need help to solve these maths from GMAT Prep   [#permalink] 11 Feb 2011, 09:39
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