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# How many gallons of water should be added to make the

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Intern
Joined: 27 Sep 2010
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Kudos [?]: 13 [1] , given: 3

How many gallons of water should be added to make the [#permalink]  22 Jan 2011, 01:10
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Difficulty:

55% (hard)

Question Stats:

32% (01:41) correct 68% (01:08) wrong based on 122 sessions
How many gallons of water should be added to make the average value of the mixture \$480 per gallon.

(1) 5 gallons of Milk type I is mixed with 6 gallons of Milk type II.
(2) Milk of type I is \$600 per gallon and the cost of type II Milk is 90% of the cost of Milk of type I.
[Reveal] Spoiler: OA

Last edited by MichelleSavina on 22 Jan 2011, 08:33, edited 1 time in total.
Manager
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Re: How many gallons of water should be added to make avg \$480? [#permalink]  22 Jan 2011, 05:45
IMO E. In the answers whater si not mentioned so we can not say how mach whater is needed...
Intern
Joined: 27 Sep 2010
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Kudos [?]: 13 [0], given: 3

Re: How many gallons of water should be added to make avg \$480? [#permalink]  23 Jan 2011, 06:06
nov79 wrote:
IMO E. In the answers whater si not mentioned so we can not say how mach whater is needed...

thank you nov79.... but i guess that is what we are suppose to find.....
Can someone please explain it in another way....
Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
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Kudos [?]: 4870 [0], given: 163

Re: How many gallons of water should be added to make avg \$480? [#permalink]  27 Jan 2011, 07:02
Expert's post
MichelleSavina wrote:
nov79 wrote:
IMO E. In the answers whater si not mentioned so we can not say how mach whater is needed...

thank you nov79.... but i guess that is what we are suppose to find.....
Can someone please explain it in another way....

Generally water is assumed to be available free of cost but it is an assumption. The writer of the question is probably testing whether you make that assumption. You should not, in a DS question. Had it been a PS question, and an answer was required, you could have assumed it.
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Karishma
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Senior Manager
Joined: 08 Nov 2010
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Re: How many gallons of water should be added to make avg \$480? [#permalink]  28 Jan 2011, 10:11
hmm. why is it not B? if u know the prices per gallon, u know how much water u need to add to each one in order to make them worth 480.

or the questions is how much when milk I + Milk II is mixed?
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Re: How many gallons of water should be added to make avg \$480? [#permalink]  28 Jan 2011, 18:03
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Expert's post
144144 wrote:
hmm. why is it not B? if u know the prices per gallon, u know how much water u need to add to each one in order to make them worth 480.

or the questions is how much when milk I + Milk II is mixed?

The question says that a mixture has milk type I and milk type II and now we need to add water to make the average value = \$480. So how much water needs to be added?

To find the volume of water, you need to know the price of all three - milk type I, milk type II and water. You also need the volume in which milk type I and milk type II were added.

B alone isn't sufficient because it just gives you the price of milk type I and type II. We don't know the volume of these two. Even when you have both statements 1 and 2, you do not know the price of water (which may not be assumed to be available free of cost)
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Senior Manager
Joined: 08 Nov 2010
Posts: 422
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Kudos [?]: 34 [0], given: 161

Re: How many gallons of water should be added to make avg \$480? [#permalink]  28 Jan 2011, 21:21
Ye, thats ez. i thought they might be asking you to reduce the price of each one of them. Thanks.
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Re: How many gallons of water should be added to make avg \$480? [#permalink]  16 Dec 2013, 11:08
VeritasPrepKarishma wrote:
MichelleSavina wrote:
nov79 wrote:
IMO E. In the answers whater si not mentioned so we can not say how mach whater is needed...

thank you nov79.... but i guess that is what we are suppose to find.....
Can someone please explain it in another way....

Generally water is assumed to be available free of cost but it is an assumption. The writer of the question is probably testing whether you make that assumption. You should not, in a DS question. Had it been a PS question, and an answer was required, you could have assumed it.

Hm.. that's confusing cause I remember doing a question where I had to assume that water was free of cost and it was correct anyway. I'll take it into account from now on

Cheers!
J
Re: How many gallons of water should be added to make avg \$480?   [#permalink] 16 Dec 2013, 11:08
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