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Proportions - GMAT Prep question

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by sukrant26 » Sun May 25, 2008 2:37 pm
Hi

How do we approach x proportional to y questions?

Can anyone help me with this one?

Answer is D

Sukrant
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Source: — Data Sufficiency |
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by aatech » Sun May 25, 2008 6:07 pm
ANS D

Q says cost is proportional to length^2 and thickness

So, C = kL^2*T, where C = cost, k is a constant, L length and T thickness

Stmt 1 - C1 = K*2^2*0.2, C2=K*2^2*0.1

C1-C2 = 160. Solve to get the value of K.... then we can calculate the value of slab given in the question .. SUFF

Stmt 2 has same logic..... SUFF
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