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

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Difficulty:

45% (medium)

Question Stats:

62% (02:23) correct
37% (01:45) wrong based on 93 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?

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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Keep trying no matter how hard it seems, it will get easier.

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

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)!!

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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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

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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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.

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.

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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