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Four cups of milk are to be poured into a 2-cup bottle and

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Four cups of milk are to be poured into a 2-cup bottle and [#permalink] New post 18 May 2009, 13:09
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Question Stats:

65% (02:26) correct 35% (01:50) wrong based on 109 sessions
Four cups of milk are to be poured into a 2-cup bottle and a 4-cup bottle. If each bottle is to be filled to the same fraction of its capacity, how many cups of milk should be poured into the 4-cup bottle?

(A) 2/3
(B) 7/3
(C) 5/2
(D) 8/3
(E) 3
[Reveal] Spoiler: OA

Last edited by Bunuel on 13 Dec 2012, 01:36, edited 1 time in total.
Renamed the topic and edited the question.
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Re: cups of milk [#permalink] New post 21 May 2009, 06:51
D) 8/3

X/2 * x/4 = 4(total number of cups)
Cross multiply
you get 4x+2x =4
combine like terms
6x = 4
solve for x
x = 4/6, must reduce to 2/3

check answer

2(2/3)+4(2/3)=4
1 (1/3) + 2 (2/3) = 4 (1.333- + 2.6666- = 4) ((- = continuing to infinity.))
4 = 4 Verified.

4 cup = 2.6666- (8/3)

Actually now that I looked at it it's D), though my math is correct I forget it only applies to 4 cup glass so 8/3 would be in it.

Last edited by Goobers82 on 21 May 2009, 15:19, edited 7 times in total.
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Re: cups of milk [#permalink] New post 21 May 2009, 07:31
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Shouldn't it be as follows?

Let the equal fraction be:
x/2 = y/4
=>x = y/2

Also, x+y=4 (The number of cups to be distributed)
=> x =4-y

Substituting for x:
y/2=4-y
=>y=8/3

Pls explain in case I'm wrong.
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Re: cups of milk [#permalink] New post 21 May 2009, 08:38
Quote:
Four cups of milk are to be poured into a 2-cup bottle and a 4-cup bottle. If each bottle is to be filled to the same fraction of its capacity, how many cups of milk should be poured into the 4-cup bottle?
(A) 2/3
(B) 7/3
(C) 5/2
(D) 8/3
(E) 3


Is the correct answer C?

I tried by POE.
a) 4 cups - 2/3 cups -->Fraction -1/6
1/6 of 2 cup bottle =1/3 cup
2/3+1/3 =1 cup

b) 4 cups - 7/3 cups -->Fraction -7/12
7/12 of 2 cup bottle =7/6 cup
7/3+7/6 =2.3 cup

c)4 cups - 5/2 cups -->Fraction -5/8
5/8 of 2 cup bottle =5/4 cup
5/2+5/4 =3.75 cup
close to 4 cups

d)8/3 came up to 2 cups

e)3 cups- the total would be 4.5

What is the answer?
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Re: cups of milk [#permalink] New post 22 May 2009, 04:32
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D is the correct answer


let x be the fraction.
4x+2x=4
6x=4 ==>x=2/3
4x=4*2/3=8/3 cups

for confirmation,
4x+2x= 4*2/3+2*2/3==>8/3+4/3=12/3==>4

hence 8/3 is the right ans...

please ignore my earlier post...
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Re: cups of milk [#permalink] New post 13 Jun 2009, 08:49
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The OA is D
I had this question on my GMATPREP and got it correct
Here is my approach
let x is the amount of milk we will pour in the 2 cups bottle and y is the amount of milk we will pour in the 4 cups bottle
=> x/2=y/4 => x=y/2
x+y=4
3y/2=4
y=8/3
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Re: cups of milk [#permalink] New post 06 Dec 2010, 08:54
I think the easiest way to approach fraction problems is by visually tie in the actual fractions to the problem.

so if X cups are poured into the 4C cup : To make the two fractions equal : X/4 (for the four Cup ) should be equal to whatever remains / 2 (to equal the 2 cup fraction-wise)!!

So the equation would become:

x/4 = (4-x)/2

Solving this:
=>x/2 = (4-x)
=>x = 8 - 2x
=>3x = 8
=>x = 8/3
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Re: cups of milk [#permalink] New post 06 Dec 2010, 17:49
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Expert's post
nvgroshar wrote:
No doubt, the answer is 8/3. The problem is how to do it practically?
I mean, just take a cup and try to fill 2/3 of it with milk.


I am a big fan of trying to solve most GMAT questions orally.
Look at it this way:
I have four cups of milk. I also have a 2 cup bottle and a 4 cup bottle. When will they have the same fraction of capacity? Since 4 cup bottle's capacity if twice of 2 cup bottle's capacity, they will have the same fraction when 4 cup bottle has twice the milk contained in 2 cup bottle. So we just have to divide the 4 cups of milk in the ratio 1:2 and give two parts to the 4 cup bottle.
So (2/3)* 4 = 8/3


Note: If they had given that the milk to be poured is 3 cups, you would have automatically said that we should put 1 cup and 2 cups in 2 cup bottle and 4 cup bottle respectively. They give such numbers to make the question a little harder.
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Re: cups of milk [#permalink] New post 06 Dec 2010, 19:36
nice way to solve practically Karishma. What resources do you recommend for these types of problems, I always have trouble with them. Would it be the Manhattan GMAT word translations book? Thanks
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Re: cups of milk [#permalink] New post 06 Dec 2010, 21:54
Expert's post
gettinit wrote:
nice way to solve practically Karishma. What resources do you recommend for these types of problems, I always have trouble with them. Would it be the Manhattan GMAT word translations book? Thanks


Actually, these are not 'types of problems'. These are 'types of solutions'. Many GMAT problems need little to no calculations. Very few need you to define variables and solve equations. It is just about getting exposed to such approaches and putting in the effort to figure these out. The more you think, the less you need to solve. After you read a statement in the question, pause and think, "What does it imply?"
Quite often, by the time you reach the question, you will have the answer in your head! Saves you loads of time but the skill is acquired with practice.
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Re: cups of milk [#permalink] New post 06 Dec 2010, 21:57
Got it thanks Karishma, thought I was missing something from my review, but need to just stop and think of a better approach rather than diving into solving.
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Re: PS 1000 Section7 Question 17 [#permalink] New post 02 Apr 2011, 06:35
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x/2 = (4-x)/4

4x = 8 - 2x

=> x = 8/6 = 4/3

So 4 - 4/3 = 8/3

I think the answer is D, but it's a typo (also, 8/2 is 4).
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Re: PS 1000 Section7 Question 17 [#permalink] New post 02 Apr 2011, 11:28
X/2 = Y/4

X+Y = 4

substituing equation 1 in 2 we get Y = 8/3

Answer is D.

And I agree with subhashghosh on the typo, option D should have been 8/3 not 8/2
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Re: cups of milk [#permalink] New post 12 Dec 2012, 14:50
Vavali wrote:
Four cups of milk are to be poured into a 2-cup bottle and a 4-cup bottle. If each bottle is to be filled to the same fraction of its capacity, how many cups of milk should be poured into the 4-cup bottle?
(A) 2/3
(B) 7/3
(C) 5/2
(D) 8/3
(E) 3


Kind of an idiosyncratic way to solve, but here it is:

we know that putting 1 cup in the 2 cups makes it 1/2 full
and that 2 cups in the 4 cups makes it 1/2 full

we have 1 cup left to distribute. need to distribute 1 part to the 2 cup and 2 parts to the 2 cup to keep the ratio.

1/3 + 2/3 =1

thus the 4 cup has 6/3+ 2/3 = 8/3
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Re: Four cups of milk are to be poured into a 2-cup bottle and [#permalink] New post 29 Dec 2012, 00:44
10 Second Method!!!

Fraction of 2 cup bottle - x
Fraction of 4 cup bottle - 2x
The above is because the fractions have to be the same and one volume is double the other

x + 2x = 4

x = 4/3

2x (4 cup bottle ) = 8/3

Hence D
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Re: Four cups of milk are to be poured into a 2-cup bottle and [#permalink] New post 30 Jan 2014, 08:44
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Re: Four cups of milk are to be poured into a 2-cup bottle and   [#permalink] 30 Jan 2014, 08:44
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