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# A milk vendor sells milk at Cost Price but still gains 20%.

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Joined: 12 Oct 2012
Posts: 22
A milk vendor sells milk at Cost Price but still gains 20%. [#permalink]

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Updated on: 29 Oct 2012, 01:37
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Difficulty:

55% (hard)

Question Stats:

48% (00:57) correct 52% (00:50) wrong based on 66 sessions

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A milk vendor sells milk at Cost Price but still gains 20%. Find the ratio of milk and water in every gallon that he sells.

A. 4:1
B. 5:1
C. 5:2
D. 6:1
E. None of these
[Reveal] Spoiler: OA

Originally posted by chris93 on 28 Oct 2012, 21:48.
Last edited by Bunuel on 29 Oct 2012, 01:37, edited 1 time in total.
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Joined: 02 Jul 2012
Posts: 1195
Location: India
Concentration: Strategy
GMAT 1: 740 Q49 V42
GPA: 3.8
WE: Engineering (Energy and Utilities)
Re: A milk vendor sells milk at Cost Price but still gains 20% [#permalink]

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28 Oct 2012, 23:01
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KUDOS
chris93 wrote:
A milk vendor sells milk at Cost Price but still gains 20%. Find the
ratio of milk and water in every gallon that he sells.

Let the vendor buy 100 L of milk. For him to make 20% profit, he has to turn this 100 L into 120 L without incurring any cost. So he has to mix 20 L of water. So ratio of milk to water is $$\frac{100}{20} = 5$$

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Re: A milk vendor sells milk at Cost Price but still gains 20%. [#permalink]

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10 Apr 2018, 20:19
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Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: A milk vendor sells milk at Cost Price but still gains 20%.   [#permalink] 10 Apr 2018, 20:19
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# A milk vendor sells milk at Cost Price but still gains 20%.

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