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Malik's recipe for 4 servings of a certain dish requires 3/2

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Malik's recipe for 4 servings of a certain dish requires 3/2  [#permalink]

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New post Updated on: 29 Apr 2014, 06:52
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Malik's recipe for 4 servings of a certain dish requires 3/2 cups of pasta. According to this recipe, what is the number of cups of pasta that Malik will use the next time he prepares this dish?

(1) The next time he prepares this dish, Malik will make half as many servings as he did the last time he prepared the dish.
(2) Malik used 6 cups of pasta the last time he prepared this dish.

Originally posted by redbeanaddict on 12 Oct 2008, 21:16.
Last edited by Bunuel on 29 Apr 2014, 06:52, edited 2 times in total.
Renamed the topic, edited the question and added the OA.
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Re: Malik's recipe for 4 servings of a certain dish requires 3/2  [#permalink]

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New post 03 Mar 2012, 04:36
16
16
morya003 wrote:
Hi Guys

Statement 1 says - (1) The next time he prepares this dish, Malik will make half as many servings as he did the last time he prepared the dish.

I interpreted this as next time he will prepare half of 4 servings which is 2 so he will need half of 1.5 cups of pasta !! :? :?

Then answer is A

Please advise


No, that's not a correct interpretation. The stem just gives us the info about the recipe for 4 servings, it doesn't say that Malik prepared 4 servings last time.

Also if you take last time to be 4, then this would be in contradiction with statement (2), because from it we get that last time Malik prepared 16 servings (6 cups of pasta are needed for 16 servings).

On the GMAT, two data sufficiency statements always provide TRUE information and these statements never contradict each other or the stem.

So, this should have been a hint that your reading of the question was not correct.

Hope it's clear.
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Re: Ratio - Malik's Recipe  [#permalink]

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New post 16 Nov 2011, 13:28
4
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Problem: To find out number of cups of pasta that Malik will use the next time he prepares this dish?
Statement - 1.5 cups needed for 4 servings

A) Talks about information related to last time he prepared the dish - Not sufficient

B) Gives the information about the last time he prepared the dish. No relation given to his Next preperation. Not Sufficient alone.

A and B together.
1.5 Cups -> 4 servings
6 Cups will give 16 servings. From B
From A we know that he will Prepare 8 servings. Hence he would need 8/(4/1.5) = 3 Cups.

Both A and B together solve the Problem. Hence C
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Re: Malik DS  [#permalink]

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New post 13 Oct 2008, 04:35
2
1
2
C

4 servings - 3/2 pasta

1. X/2 with X unknown
Not Sufficient
2. He used 6 cups of pasta last time, means he prepared the recipe for 16 servings
Not Sufficient

Together
Sufficient
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Re: Malik's recipe for 4 servings of a certain dish requires 3/2  [#permalink]

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New post 03 Mar 2012, 04:16
1
Hi Guys

Statement 1 says - (1) The next time he prepares this dish, Malik will make half as many servings as he did the last time he prepared the dish.

I interpreted this as next time he will prepare half of 4 servings which is 2 so he will need half of 1.5 cups of pasta !! :? :?

Then answer is A

Please advise
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Re: Malik's recipe for 4 servings of a certain dish requires 3/2  [#permalink]

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New post 25 Feb 2013, 03:13
1
Statement 1

Next time = 1/2 last time - we don't have any other info

Statement 2

Last time = 6

Combined

6/2 = 3?


From A we know that he will Prepare 8 servings. Hence he would need 8/(4/1.5) = 3 Cups.

I didn't understand the above step...
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Re: Malik's recipe for 4 servings of a certain dish requires 3/2  [#permalink]

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New post 25 Feb 2013, 11:42
1
The difference in understanding is because the initial author calculated in terms of number of servings while you calculated directly based on the number of cups of Pasta

What you did gives you the answer on the combined step itself and you don't need the last step "From A we know that he will Prepare 8 servings. Hence he would need 8/(4/1.5) = 3 Cups."

However, if you calculated based on the number of servings, it would have worked out as shown below

1.5 cups of pasta needed for making 4 servings.
based on statement 2, 6 cups of Pasts will give us 6*4/1.5=16 servings. --a

These 16 servings were made last time. We know from statement 1

Number of servings next time= half the number of servings of pasta that he made last time.

Hence, next time servings=8

how many cups of pasta would be required to make 8 servings of pasta?

4 servings=1.5 cups of pasta
8 servings=3 cups of pasta (8/(4/1.5) = 3 Cups.)

Hope this helps!

fozzzy wrote:
Statement 1

Next time = 1/2 last time - we don't have any other info

Statement 2

Last time = 6

Combined

6/2 = 3?


From A we know that he will Prepare 8 servings. Hence he would need 8/(4/1.5) = 3 Cups.

I didn't understand the above step...
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Re: Ratios  [#permalink]

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New post 23 Apr 2013, 00:02
1
kabilank87 wrote:
Malik's recipie of 4 servings of a certain dish requires a 1.5 cups of pasta.According to this recipie what is the number of cups of pasta malik will use the next time he prepares the dish ?

a. the next time he prepares the dish mailk will use half as many servings as he did the last time he prepares the dish.
b. Malik used 6 cups of pasta the last time he prepared the dish.


Here, my main doubt is the first sentences " Malik 's recipie of 4 servings of a certain dish requires a 1.5 cups of pasta " is a ratio or a data. If it is a data, the " last time " mentioned in the option A refers to this last. I mean did he prepared 4 servings of certain dish last time.I assumed this way but the my answer is wrong.
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Re: Ratios  [#permalink]

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New post 23 Apr 2013, 03:44
kabilank87 wrote:
kabilank87 wrote:
Malik's recipie of 4 servings of a certain dish requires a 1.5 cups of pasta.According to this recipie what is the number of cups of pasta malik will use the next time he prepares the dish ?

a. the next time he prepares the dish mailk will use half as many servings as he did the last time he prepares the dish.
b. Malik used 6 cups of pasta the last time he prepared the dish.


Here, my main doubt is the first sentences " Malik 's recipie of 4 servings of a certain dish requires a 1.5 cups of pasta " is a ratio or a data. If it is a data, the " last time " mentioned in the option A refers to this last. I mean did he prepared 4 servings of certain dish last time.I assumed this way but the my answer is wrong.


For 4 servings of certain pasta dish he would need 1.5 cups of pasta. to serve for four people he would need 1.5 cups of pasta to prepare the final dish.
so in essence it is a ratio. servings/cups of pasta = 4/1.5.

using stmt 1 or 2 alone we cannot deduce the answer.
But using both we have enough information to deduce the answer.
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Re: Malik's recipe for 4 servings of a certain dish requires 3/2  [#permalink]

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New post 30 Aug 2013, 10:15
morya003 wrote:
Hi Guys

Statement 1 says - (1) The next time he prepares this dish, Malik will make half as many servings as he did the last time he prepared the dish.

I interpreted this as next time he will prepare half of 4 servings which is 2 so he will need half of 1.5 cups of pasta !! :? :?

Then answer is A

Please advise



Me too.. :(
Bunuel's pointed a VERY GOOD reminder that the statements never contradict each other (I almost forgot!)

Thanks Bunuel.
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Re: Malik's recipe for 4 servings of a certain dish requires 3/2  [#permalink]

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New post 29 Apr 2014, 06:53
4
7
redbeanaddict wrote:
Malik's recipe for 4 servings of a certain dish requires 3/2 cups of pasta. According to this recipe, what is the number of cups of pasta that Malik will use the next time he prepares this dish?

(1) The next time he prepares this dish, Malik will make half as many servings as he did the last time he prepared the dish.
(2) Malik used 6 cups of pasta the last time he prepared this dish.


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Re: Malik's recipe for 4 servings of a certain dish requires 3/2  [#permalink]

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New post 25 Feb 2015, 09:14
Nice questions. I missed the word "last time".
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Re: Malik's recipe for 4 servings of a certain dish requires 3/2  [#permalink]

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New post 02 Apr 2015, 11:34
messed up question for sure!
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Re: Malik's recipe for 4 servings of a certain dish requires 3/2  [#permalink]

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New post 11 May 2015, 04:02
1
1
4 servings of dish require 1.5 cups of pasta
=> 1 serving of dish require 1.5/4 cups of pasta
(1) is insufficient because it just says: "Malik will make half as many servings as he did the last time he prepared the dish.". However, we don't know how many servings he prepared last time. Since we don't know the servings, we can't find how much pasta is required. So, insufficient.

(2) says Malik used 6 cups of pasta the last time he prepared this dish. Just looking at this statement in isolation, if 6 cups of pasta the last time, we clearly can't say how many cups of pasta Malik will use the "next time". So, insufficient.

Combining (1) and (2), we know that he used 6 cups of pasta the last time and Malik will make half as many servings as he did the last time. That being the case, Malik will clearly require 3 cups of pasta next time. Sufficient.

Hence, C.
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Re: Malik's recipe for 4 servings of a certain dish requires 3/2  [#permalink]

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New post 04 Oct 2016, 07:22
2
Looks like a Critical Reasoning Problem haha
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Re: Malik's recipe for 4 servings of a certain dish requires 3/2  [#permalink]

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New post 28 Dec 2016, 13:36
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horrible question for non native speakers.. Strange it's gmat prep..
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Re: Malik's recipe for 4 servings of a certain dish requires 3/2  [#permalink]

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New post 23 Feb 2018, 02:41
He needs 1.5 cups of past for every 4 servings.

St.2 tells us that he used 6 cups, thus he must have prepared 16 servings LAST TIME

St.1 tells us that the NEXT TIME he prepared half of the servings of LAST TIME, so 8. Thus he needs 3 cups of pasta :)
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Re: Malik's recipe for 4 servings of a certain dish requires 3/2  [#permalink]

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New post 23 Feb 2018, 08:43
1
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redbeanaddict wrote:
Malik's recipe for 4 servings of a certain dish requires 3/2 cups of pasta. According to this recipe, what is the number of cups of pasta that Malik will use the next time he prepares this dish?

(1) The next time he prepares this dish, Malik will make half as many servings as he did the last time he prepared the dish.
(2) Malik used 6 cups of pasta the last time he prepared this dish.


Target question: How many cups of pasta will Malik use the next time he prepares this dish?

Given: 4 servings of a certain dish requires 1 1/2 cups of pasta.
So, if we can determine the NUMBER OF DISH SERVINGS Malik prepares, we can determine how much past is required.

Statement 1: The next time he prepare this dish, Malik will make half as many servings as he did the last time he prepared the dish
We have no idea how many servings Malik made last time. So, we cannot determine the number of servings he'll make next time.
So, statement 1 is NOT SUFFICIENT

Statement 2: Malik used 6 cups of pasta the last time he prepared this dish
This information does not help us determine how much pasta he'll need NEXT TIME.
So, statement 2 is NOT SUFFICIENT

Statements 1 and 2 combined
Statement 2: Malik used 6 cups of pasta the last time
Statement 1: Next time, Malik will make half as many servings as he did the last time. If we makes half as many servings, Malik will need half as much pasta as he needed last time.
So, Malik will need 3 cups of pasta next time
Since we can answer the target question with certainty, the combined statements are SUFFICIENT

Answer = C

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Re: Malik's recipe for 4 servings of a certain dish requires 3/2  [#permalink]

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New post 25 Nov 2018, 11:51
A detailed explanation can be found in this video:
https://www.youtube.com/watch?v=rb1Z3EnrzpY

For a DS question, always ask, "What would I need to know in order to answer this question?" Here, what we need to know is the number of servings in the next recipe - that information would tell us everything we need to know in order to answer the initial question.

This is a proportion question, but (like most word problems!) there's a trap answer. In this case, the trap answer its answer A - we're told what the recipe is, be we aren't told how many serving there were in the LAST recipe! That rules out answers A and D.

In combination, however, statements (1) and (2) together do tell us everything we need to know.

Answer C
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Re: Malik's recipe for 4 servings of a certain dish requires 3/2  [#permalink]

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New post 06 Dec 2018, 13:26
Question: What is the # of cups that will be used NEXT TIME?

Before we jump into the statements, first we have to recognize the following pattern:
- For 4-Servings, 1.5 cups are needed
- For 8-Servings, 3 cups are needed
- For 12-Servings, 4.5 cups are needed
- For 16-Servings, 6 cups are needed
- For 20-Servings, 7.5 cups are needed
- and so on...

Now, with this in mind let's jump into the statements:

(1) NextTimeServings = 1/2 LastTimeServings or 2NextTimeServings = LastTimeServings.
This statement is insufficient because LastTimeServings= ???

(2) According to the pattern above we see that LastTimeServings = 16 but there are no info about NextTimeServing
This statement is insufficient

(1 and 2) Combining both statements we get two equations as follows:
from (1) 2NextTimeServing = LastTimeServing
from (2) LastTimeServing = 16

so NextTimeServing = 8 and from the pattern above it seems obviously that Malik will use 3 cups of pasta.

Correct answer is (C)
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Re: Malik's recipe for 4 servings of a certain dish requires 3/2 &nbs [#permalink] 06 Dec 2018, 13:26
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