Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized for You

we will pick new questions that match your level based on your Timer History

Track Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

Material A costs $3 per kilogram, and material B costs $5 [#permalink]
13 Aug 2009, 14:55

1

This post was BOOKMARKED

00:00

A

B

C

D

E

Difficulty:

45% (medium)

Question Stats:

58% (01:54) correct
42% (01:31) wrong based on 112 sessions

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.

Re: Material A costs $3 per kilogram, and material B costs $5 pe [#permalink]
13 Aug 2009, 15:10

tejal777 wrote:

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.

umm...(D) is it??

Yeah...its D.

St1: if y>4, then x =< 5 => x =< y => SUFFICIENT

St2: If 10 kg of material k cost $40, then x = y = 5 But if it costs less than $40 then y < 5 => x > 5 => SUFFICIENT

Re: Material A costs $3 per kilogram, and material B costs $5 pe [#permalink]
13 Aug 2009, 20:49

What if x = 4.9 kgs and y = 4.1 kgs? How do you know that material k consists materials A and B only in whole kgs?

B is not a big deal.

samrus98 wrote:

tejal777 wrote:

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.

umm...(D) is it??

Yeah...its D.

St1: if y>4, then x =< 5 => x =< y => SUFFICIENT

St2: If 10 kg of material k cost $40, then x = y = 5 But if it costs less than $40 then y < 5 => x > 5 => SUFFICIENT

Re: Material A costs $3 per kilogram, and material B costs $5 pe [#permalink]
14 Aug 2009, 03:14

1

This post received KUDOS

yezz wrote:

samrus98 wrote:

tejal777 wrote:

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.

umm...(D) is it??

Yeah...its D.

St1: if y>4, then x =< 5 => x =< y => SUFFICIENT

St2: If 10 kg of material k cost $40, then x = y = 5 But if it costs less than $40 then y < 5 => x > 5 => SUFFICIENT

ANS: D

Can you plz explain why we are excluding non intiger values for x,y? thanks

Its a mistake.

X & Y can take non-integer values as well and that makes St1 insufficient. Revised ANS: B _________________

Re: Material A costs $3 per kilogram, and material B costs $5 pe [#permalink]
17 Sep 2009, 10:13

B. couple of examples: x=4, y=6, sum>40. not satisfies x=5, y=5, sum =40. not satisfies x=6, y=4, sum<40. satisfies non-integers should be taken into account as well. However, they all satisfy this. _________________

Re: Material A costs $3 per kilogram, and material B costs $5 pe [#permalink]
24 Sep 2009, 08:51

tejal777 wrote:

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.

umm...(D) is it??

Hi,

From the stem we have: X (MAT A) + Y (MAT B) =10 (i) and 3X+5Y=TOTAL COST. (II)

FOR (1): Y>4. Y=4,1 and X=5,9 OR Y=6 and X=4 (INSUFFI)

FOR (2): 3X+5Y<40 ; 40*(I) => 40X+40Y=40 ; We have that 3x+5y< 40X+40Y => -37x<35y; Again (X+Y=10)=> X=6,Y=4 or X=4,Y=6 We dont know really. (INSUFFI)

FOR (1) and (2) => The same, we dont any more information! FOR THIS, IMO (E)

Re: Material A costs $3 per kilogram, and material B costs $5 pe [#permalink]
19 Oct 2009, 23:57

Came back to the question again:(

Quote:

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.

OE says: Since x + y = 10, the relation x > y is equivalent to x > 10 – x, or x > 5. (1) The given information is consistent with x = 5.5 and y = 4.5, and the given information is also consistent with x = y = 5. Therefore, it is possible for x > y to be true and it is possible for x > y to be false; NOT sufficient.

How can we take the case of x = y = 5 when we know x>5?? _________________