manne

stem: Cost= X*Thinkness*Length^2, where X is coefficient of proportion/price per unit of length and thikness Choice 1 gives the price difference of Th1 L1 X and Th2 L2 X. 0.2*4*X=0.1*4*X+160 X=400 Sufficient the same with 2 thus D

1. I'll take A instead of B. 'instead of' denotes substitution - i will not take A, i'll take B as a substitute of A. 2.I'll rather take A than B. 'rather than' denotes preference - both A and B are ok, but I prefer A and I will take A more eagerly than I would take B.

DoingMyPart, Mt.Rainer, So, the only difference I see is: specially 1. in a special manner; "a specially arranged dinner" [syn: especially] 2: to a distinctly greater extent or degree than is common; "he was particularly fussy about spelling"; especially 1: to a distinctly greater extent or degree than is common;"he was particularly fussy about spelling"; 2. in a special manner; "a specially arranged dinner" [syn: specially]

i choose E, because it's the only variant without ambiguous 'they/their' referring to 'army'. but even E doesn't look perfect

agree with 800Bob, It's A Besides, I doubt that 'to contend something' (as in E) is idiomatic. What do you think?

C 'to deal' seems more precise. What's the difference btw specially and Especially ???

gmat0850 what scares me in C is 'formation is when materials combust'. Formation is a process, not a time. It cannot be 'when'. May be, this question is not properly worded. May be the authors meant 'Imperceptible to the eye or the nose' ? :)

B 'require that the info be published' - idiomatic

A says 'evidence for societies' E says 'evedence that societies arose simultaneously' Logically, it is the point of when and how societies arose rather than a point of whether there were any societies.

B. completely avoids ambiguity. Other variants use strange ellipse of the verb.

only D clearly says 'monoxide is formed when materials are combusted' but 'monoxide imperceptible to the ear' is really strange

1. 'Majority view but think' - only D&E maintain parallelism. E. 'would in the future' - wrong tense, sice we have Present (view) not Past hence D 2. waiting for a reasonable explanation :) The only thing that bothers me in D is abundance of 'like', while B is more precise.

not A,B,D because of 'that' meaning 'goods' not C because of 'goods in worth'. It looks unidiomatic and even if it's not, imho it means smth like 'valuable goods' Hence E

I see it in the following way: now B doesn't have this useless 'by' preposition, but still B parallels unequal concepts: 'such a variety of criteria as ABC'. Variety parallel with ABC. But these ABC are not a variety, they are certain criteria. A says: 'variety of criteria such as ABC'. Criteria and ABC are parallel. That's why I chose A. hope it helps

C. there's elipse here. Second 'are' is not obligatory, like in 'I'm as old as you (are)' A. unidiomatically says 'MG are likely in planning'