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05 Aug 2008, 11:14
Kudos
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I must have completely misunderstood this problem. 
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05 Aug 2008, 13:14
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flygmat
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.
05 Aug 2008, 17:40
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flygmat
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
