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A bottle contains a certain solution. In the bottled solution, the rat

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A bottle contains a certain solution. In the bottled solution, the rat [#permalink]

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New post 05 Apr 2016, 05:44
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A bottle contains a certain solution. In the bottled solution, the ratio of water to soap is 3:2, and the ratio of soap to salt is three times this ratio. The solution is poured into an open container, and after some time, the ratio of water to soap in the open container is halved by water evaporation. At that time, what is the ratio of water to salt in the solution?

A. 1:1
B. 2:3
C. 3:2
D. 9:4
E. 27:8
[Reveal] Spoiler: OA

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Re: A bottle contains a certain solution. In the bottled solution, the rat [#permalink]

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New post 05 Apr 2016, 06:01
Bunuel wrote:
A bottle contains a certain solution. In the bottled solution, the ratio of water to soap is 3:2, and the ratio of soap to salt is three times this ratio. The solution is poured into an open container, and after some time, the ratio of water to soap in the open container is halved by water evaporation. At that time, what is the ratio of water to salt in the solution?

A. 1:1
B. 2:3
C. 3:2
D. 9:4
E. 27:8


Hi,
W:Soap = 3:2 and
Soap :Salt = 9:2..

however the ratio of W:S is halved due to evaporation = 3:4..
so Multiply W:S by 9 and S:Salt by 4 to get combined ratio
so W:S:Salt = 3*9 : 4*9 : 2*4 = 27 : 36 : 8
so Ratio of W: Salt = 27 : 8..
ans E
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Re: A bottle contains a certain solution. In the bottled solution, the rat [#permalink]

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New post 05 Apr 2016, 06:07
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Water:soap = 3:2

Soap:Salt=9:2

=> For 9 soap, salt = 2
=> For 2 Soap, salt = (2/9)*2 = 4/9

So, water:soap:salt = 3:2:4/9 = 27:18:4

After open container, water:soap:salt = 13.5:18:4

So, water:salt = 13.5:4 = 27:8
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Re: A bottle contains a certain solution. In the bottled solution, the rat [#permalink]

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New post 23 Feb 2017, 04:50
Bunuel wrote:
A bottle contains a certain solution. In the bottled solution, the ratio of water to soap is 3:2, and the ratio of soap to salt is three times this ratio. The solution is poured into an open container, and after some time, the ratio of water to soap in the open container is halved by water evaporation. At that time, what is the ratio of water to salt in the solution?

A. 1:1
B. 2:3
C. 3:2
D. 9:4
E. 27:8


Hi,

Could you please explain why are we not considering evaporation of salt and soap? :?

Thanks
Expert Post
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Joined: 02 Sep 2009
Posts: 43828
Re: A bottle contains a certain solution. In the bottled solution, the rat [#permalink]

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New post 23 Feb 2017, 04:59
ashupatil wrote:
Bunuel wrote:
A bottle contains a certain solution. In the bottled solution, the ratio of water to soap is 3:2, and the ratio of soap to salt is three times this ratio. The solution is poured into an open container, and after some time, the ratio of water to soap in the open container is halved by water evaporation. At that time, what is the ratio of water to salt in the solution?

A. 1:1
B. 2:3
C. 3:2
D. 9:4
E. 27:8


Hi,

Could you please explain why are we not considering evaporation of salt and soap? :?

Thanks


It is assumed that only water evaporates. .
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Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

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Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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A bottle contains a certain solution. In the bottled solution, the rat [#permalink]

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New post 23 Feb 2017, 09:10
Bunuel wrote:
A bottle contains a certain solution. In the bottled solution, the ratio of water to soap is 3:2, and the ratio of soap to salt is three times this ratio. The solution is poured into an open container, and after some time, the ratio of water to soap in the open container is halved by water evaporation. At that time, what is the ratio of water to salt in the solution?

A. 1:1
B. 2:3
C. 3:2
D. 9:4
E. 27:8


original water:soap ratio=3:2=27:18
and original soap:salt ratio=3*3:2=9:2=18:4
thus original water:salt ratio=27:4
half the water is lost during evaporation
thus new water:salt ratio=27/2:4=27:8
E
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Re: A bottle contains a certain solution. In the bottled solution, the rat [#permalink]

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New post 27 Feb 2017, 10:50
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Expert's post
Bunuel wrote:
A bottle contains a certain solution. In the bottled solution, the ratio of water to soap is 3:2, and the ratio of soap to salt is three times this ratio. The solution is poured into an open container, and after some time, the ratio of water to soap in the open container is halved by water evaporation. At that time, what is the ratio of water to salt in the solution?

A. 1:1
B. 2:3
C. 3:2
D. 9:4
E. 27:8


We are given that in a bottled solution, the ratio of water to soap is 3 : 2. Since the ratio of soap to salt is three times this ratio, the ratio of soap to salt is 9 : 2. We see the number for soap in the first ratio is 2 while that in the second is 9. We can make them the same number by using their LCM. Since the LCM of 2 and 9 is 18, we can say the ratio of water to soap is 27 : 18 and the ratio of soap to salt is 18 : 4. Thus:

water : soap : salt = 27 : 18 : 4

If the ratio of water to soap is halved by water evaporation, the new ratio of water to soap is 13.5 : 18 and the new ratio of water : soap : salt is 13.5 : 18 : 4. Thus, the ratio of water to salt after water evaporation is 13.5 : 4 or 27 : 8.

Answer: E
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Re: A bottle contains a certain solution. In the bottled solution, the rat   [#permalink] 27 Feb 2017, 10:50
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