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Material A costs $3 per kilogram, and material B costs $5 [#permalink]
19 Jun 2008, 06:24

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Material A costs $3 per kilogram, and material B costs $5 per kilogram. If 10 kilograms of material K consists of x kilograms of material A and y kilograms of material B, is x > y? (1) y > 4 (2) The cost of the 10 kilograms of material K is less than $40.

A - easy to eliminate b/c it does not relate anything to the cost which is the ratio that we need to relate to. = insuff B - I approached it this way: What are the possibilities of A and B. I tend to start with the equality to see if it works or on which side it will fall. So A = 5 and B = 5. => (5*5) + (3*5) = 25 + 15 = 40. So if they are equal it will be $40. The only way to get it to be <$40 is to have more B than A. So we have enough to solve. Suff

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