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Material A costs $3 per kilogram, and material B costs $5 [#permalink]

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19 Jul 2007, 06:14

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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.

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.

I think the answer is B.

Question: Is x larger than y?

We know that
x+y = 10. So x=10-y
Cost of K=3x+5y

Stmt 1: y could equal 5, so x not larger than y. Or y could equal 6, then x is not larger than y. INSUFF.

Stmt 2: 3x+5y<40.
3(10-y)+5y<40
2y<10
y<5. Since y<5, x must be larger than 5. SUFF.

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.

I think the answer is B.

Question: Is x larger than y?

We know that x+y = 10. So x=10-y Cost of K=3x+5y

Stmt 1: y could equal 5, so x not larger than y. Or y could equal 6, then x is not larger than y. INSUFF.

Stmt 2: 3x+5y<40. 3(10-y)+5y<40 2y<10 y<5. Since y<5, x must be larger than 5. SUFF.

Question:
Is X>Y? This is a "Yes" or "No" DS question
Given:
X + Y = 10
3X + 5Y = K

statement 1:
Y > 4.

If greater than 4, it APPEARS that Y would have to be 5, 6, 7, 8, 9, or 10. If that were the case, then X would APPEAR to be 5, 4, 3, 2, 1 or 0. In any case, this would APPEAR sufficient to answer "Is X > Y". Answer: No, since it appears X is either equal to or less than Y.
HOWEVER, statement 1 is insufficient because it does not account for partial numbers. What if Y is 4.5 and X is 5.5? Then yes, X is indeed greater than Y.

statement 2:
K < 40.

3X + 5Y < 40
combine with given X + Y = 10
substitute X = 10 - Y

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.

While I agree with x+y= 10 . But it says material consists of A and B which made me belief that that it may consist some other material also . So I started with x + y < 10 and was leading no where but E. Anyway if x+y = 10 , solution is pretty simple.