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# Help with Quant questions

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Manager
Joined: 21 Aug 2011
Posts: 65
Concentration: Economics, Social Entrepreneurship
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Kudos [?]: 11 [1] , given: 17

Help with Quant questions [#permalink]

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31 Oct 2011, 03:54
1
KUDOS
Hi all.
I don't understand how they go to the answer. The ones that I got right was guess work.
Thank you for your help
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Tough Questions.docx [323.32 KiB]

Tough Questions.docx [323.32 KiB]

Manager
Status: SC SC SC SC SC.... Concentrating on SC alone.
Joined: 20 Dec 2010
Posts: 240
Location: India
Concentration: General Management
GMAT Date: 12-30-2011
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Kudos [?]: 60 [0], given: 47

Re: Help with Quant questions [#permalink]

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31 Oct 2011, 05:07
3) Take common numbers from the column. You prephrase it as

1*( 1 -2 +3 -4 +5 -6 +7) + 2( 1 2 +3 -4 +5..+7) + 3*(..) + 4*(..) +..+ 7*(..)
=> 1*(4) + 2*(4) + 3*(4)+..7*(4) = 112
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D- Day December 30 2011. Hoping for the happiest new year celebrations !

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Manager
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Re: Help with Quant questions [#permalink]

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31 Oct 2011, 05:15
1
KUDOS
4. GCD(x,y ) * LCM(x,y) = X * Y --> RULE
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D- Day December 30 2011. Hoping for the happiest new year celebrations !

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Manager
Status: SC SC SC SC SC.... Concentrating on SC alone.
Joined: 20 Dec 2010
Posts: 240
Location: India
Concentration: General Management
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Kudos [?]: 60 [1] , given: 47

Re: Help with Quant questions [#permalink]

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31 Oct 2011, 05:20
1
KUDOS
5. initially k/b = 5/3

after the gift it becomes (5x - 10 ) / (3x +10) and this equals 7/5

on solving for x we get 30.
substitue it in the eqn aftr gifting. k = 140 and b=100.

the diff = 40
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Manager
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Re: Help with Quant questions [#permalink]

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31 Oct 2011, 05:25
1
KUDOS
6.

Option 1 . t<0. Clearly both t and k must be negative. So the kt is positive and hence to the right of t

Option 2. k<1. We have three options.
0<k<1. In this case kt will be in between k and t.
k=0. In this case it will be as same as k.
k<0. This can be negative if t is +ve. It can go to the right of t if both k and t are negative.

So clearly a.
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D- Day December 30 2011. Hoping for the happiest new year celebrations !

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Manager
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Re: Help with Quant questions [#permalink]

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31 Oct 2011, 05:50
1
KUDOS
2.

The given qstn can be re phrased as.

P ( white or even ) = P( white ) + P( even ) - P(white and even )

option 1. P(white and even ) =0
option 2. P(white) - P(even ) = 0.2

Hence not enough. E
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D- Day December 30 2011. Hoping for the happiest new year celebrations !

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Manager
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Re: Help with Quant questions [#permalink]

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31 Oct 2011, 06:11
1
KUDOS
1.

Take the full triangle.

LP + LR + LT = 180
LR + LT = 90. since LP = 90. -------(1)

In isosceles triangle RQS, LRSQ = LRQS
Hence Sum of angles in triangle RQS
LR + LRQS + LRSQ = 180
LR = 180 - 2(LRSQ) --------------(2) since LRSQ = LRQS

In isosceles triangle TUS, similarly
LT = 180 - 2(LUST) ------------(3)

From the figure we know that,
LUST + Lx + LQSR = 180
LQSR = 180 - x - LUST -------------------(4)

Substitue (2) (3) and (4) in (1)
we get,
180 - 2*LQSR + 180 - 2*(LUST) = 90
360 - 2*(LQSR) - 2*(180 - x - LUST) = 90
On cancelling it out,
2x = 90 alone remains.
x = 45.

Phew... !!
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Manager
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Re: Help with Quant questions [#permalink]

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31 Oct 2011, 06:40
KSP.. You're the man.
I like the way you broke it down with explation.
I owe you one..

Thanks a lot .

My D-Day is December 3rd. I score a 45 on this GMAT Prep. I hope my D-Day I can score at least 48
Manager
Status: SC SC SC SC SC.... Concentrating on SC alone.
Joined: 20 Dec 2010
Posts: 240
Location: India
Concentration: General Management
GMAT Date: 12-30-2011
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Kudos [?]: 60 [0], given: 47

Re: Help with Quant questions [#permalink]

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31 Oct 2011, 06:59
Hey dude... Am no expert man... Am giving my gmat on nov 22. Me too in ur range.

One thing i noticed in similar problems like 1st qstn.

We need to first rephrase the entire triangle and then if we narrow down we will arrive at the answer. If we start from the unknown, then we will be lost. This approach helped me in many similar qstns.
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D- Day December 30 2011. Hoping for the happiest new year celebrations !

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Manager
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Concentration: Economics, Social Entrepreneurship
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Kudos [?]: 11 [0], given: 17

Re: Help with Quant questions [#permalink]

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01 Nov 2011, 11:50
Dude.. Expert or not, your input was really valuable.

Now I can focus on my verbal while still improving my quant.. Still can't score past 34 in verbal. RC's killing me.
Manager
Status: SC SC SC SC SC.... Concentrating on SC alone.
Joined: 20 Dec 2010
Posts: 240
Location: India
Concentration: General Management
GMAT Date: 12-30-2011
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Kudos [?]: 60 [0], given: 47

Re: Help with Quant questions [#permalink]

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01 Nov 2011, 23:25
For RC, for me the Kaplan strategy worked well. Giv it a try dude. I felt the time reduced greatly.
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Re: Help with Quant questions   [#permalink] 01 Nov 2011, 23:25
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