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# I must have completely misunderstood this problem

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Intern
Joined: 22 Jul 2008
Posts: 10
I must have completely misunderstood this problem [#permalink]

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05 Aug 2008, 11:14
1
KUDOS
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

I must have completely misunderstood this problem.
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SVP
Joined: 07 Nov 2007
Posts: 1761
Location: New York
Re: GMATPREP square slab [#permalink]

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05 Aug 2008, 13:14
flygmat wrote:
I must have completely misunderstood this problem.

c=cost
l = lenght of slab
t = thickenss
k= constant.

C = k * L^2 * t

1) k * L1^2 * t1 +160 = k* L2^2 * t1
L1, t1, L2, t1 are given in the equation .. we can find K.

Subsititu k to find the cost (in original question)..
C = k * L3^2 * t3

suffcieint
2) same as above
Suffciient

D is the answer.
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VP
Joined: 17 Jun 2008
Posts: 1325
Re: GMATPREP square slab [#permalink]

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05 Aug 2008, 17:40
1
KUDOS
flygmat wrote:
I must have completely misunderstood this problem.

say t=thickness and l=length
cost=k(t)(l^2)
now (1) says
k(0.2)(4)=k(4)(0.1)+160 => k can be known and hence is SUFFI to find cost of given plank
(2) says : k(9)(0.1)=k(4)(0.1)+200 => k can be known and hence is SUFFI to find cost of given plank

IMO D
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Manager
Joined: 04 Sep 2007
Posts: 208
Re: GMATPREP square slab [#permalink]

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05 Aug 2008, 19:29
1
KUDOS
x2suresh wrote:
flygmat wrote:
I must have completely misunderstood this problem.

c=cost
l = lenght of slab
t = thickenss
k= constant.

C = k * L^2 * t

1) k * L1^2 * t1 +160 = k* L2^2 * t1
L1, t1, L2, t1 are given in the equation .. we can find K.

Subsititu k to find the cost (in original question)..
C = k * L3^2 * t3

suffcieint
2) same as above
Suffciient

D is the answer.

One more for D. BTW, Nice solution, Suresh. Some of you folks on this forum must consider becoming a Kaplan tutor when you are done with this GMAT thing.
Re: GMATPREP square slab   [#permalink] 05 Aug 2008, 19:29
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# I must have completely misunderstood this problem

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