12 Days of Christmas GMAT Competition - Day 2: All of the desserts

Question

12 Days of Christmas GMAT Competition with Lots of Fun

All of the desserts purchased last Friday for the Avery party were purchased from Kelsey’s Bakery. None of the desserts made at Kelsey’s Bakery contain nuts. This limitation therefore places some restrictions on the types of desserts made at Kelsey’s Bakery. For example, no traditional baklavas are made without nuts, and most traditional baklavas are made with walnuts. Last week, Kelsey’s Bakery made spice cakes, but none of the desserts purchased last Friday were spice cakes.

If the above statements are true, each of the following must also be true EXCEPT

(A) If Kelsey’s Bakery makes baklava, then that baklava is not traditional baklava.
(B) The Avery party did not purchase spice cakes from Kelsey’s Bakery last Friday.
(C) None of the desserts purchased for the Avery party contain nuts.
(D) Some spice cakes do not contain nuts.
(E) Kelsey’s Bakery does not make carrot cakes unless those carrot cakes are nut-free.

Bunuel · Accepted Answer

Manhattan Prep Official Explanation

Step 1: Identify the Question 
 
The words which of the following must also be true in the question stem indicate that this is an Inference question.

Step 2: Deconstruct the Argument 
 
As is the case with most Inference questions, there is no traditional argument here. Instead, the paragraph contains a list of facts: 
(1) The Avery party purchased desserts from Kelsey’s Bakery last Friday.
(2) Kelsey’s Bakery does not produce any desserts that contain nuts. 
(3) Because Kelsey’s Bakery does not produce any desserts with nuts, there are certain desserts, such as traditional baklavas, that Kelsey’s Bakery does not make.
(4) Last week, Kelsey’s Bakery made spice cakes, but none of these were sold on Friday.

Step 3: Pause and State the Goal 
 
On Inference questions, the task is to identify which answer choice is completely provable from only the given information. Since this is an Inference EXCEPT variation, four of the choices will be completely provable, and one choice will be either false or not provable. That one false or not provable choice will be the correct answer.

Step 4: Work From Wrong to Right

(A) Since Kelsey’s Bakery does not make any desserts that contain nuts, and since all traditional baklavas contain nuts, Kelsey’s Bakery does not make any traditional baklavas. Kelsey’s Bakery may make baklavas, but if that is the case, those baklavas cannot be traditional baklavas. (Note that this choice uses a conditional  if  statement: The choice does not state that Kelsey’s Bakery  does  make baklavas, merely that  if  it does, then those baklavas are not traditional.)

(B) All of the desserts that the Avery party purchased from Kelsey’s Bakery were purchased last Friday, and none of the spice cakes were sold last Friday, so this statement is provable from the given information.

(C) CORRECT.  While it is true that none of the desserts the Avery party purchased from Kelsey’s Bakery would contain nuts, and also true that all of the desserts the Avery party purchased last Friday were from Kelsey’s Bakery, the paragraph makes no mention of whether the Avery party purchased any desserts on other days of the week from other bakeries. It is possible that the Avery party purchased desserts on other days from other bakeries, and these desserts may contain nuts. This statement is not provable from the information given.

(D) Since Kelsey’s Bakery makes spice cakes, there must be some spice cakes (at least the ones made at Kelsey’s Bakery) that do not contain nuts.

(E) While the paragraph makes no mention of carrot cake, it does state that Kelsey’s Bakery makes no nut-containing desserts. As with choice (A), note that this choice uses conditional language: If Kelsey’s Bakery does make carrot cake, that carrot cake must be nut-free.

wadhwakaran · Answer

(A) If Kelsey’s Bakery makes baklava, then that baklava is not traditional baklava. Incorrect as this can be inferred (can be inferred)
(B) The Avery party did not purchase spice cakes from Kelsey’s Bakery last Friday. Incorrect as this can be inferred.
(C) None of the desserts purchased for the Avery party contain nuts.  Cannot be inferred because we only know about the desserts purchased on Friday. What if the desserts for the Avery party were also purchased on other days. Therefore, Correct 
(D) Some spice cakes do not contain nuts. Incorrect as this can be inferred.
(E) Kelsey’s Bakery does not make carrot cakes unless those carrot cakes are nut-free.  Incorrect

mysterymanrog · Answer

Lovely Q as usual from MGMAT!

A) This is true. The passage clearly states that the Bakery does not make anything with nuts and that no traditional baklava is made without nuts. Therefore, if the Bakery does make a Baklava, it cannot be a traditional one.

B) This is consistent with the passage. The passage tells us that all the deserts bought on Friday from the Avery Party were from the Bakery, and that the Bakery did not sell any spice cakes.

C) This is not consistent. Read the passage carefully "All the deserts purchased LAST FRIDAY from the Avery Party were from the Bakery". We only know about what was purchased on Friday, and not on any other day. It is possible that they purchased from another store on another day. This is not a must be true.

D) Consistent. We are told that the bakery made spice makes, and that the bakery does not make anything with nuts.

E) This is once again consistent. If the Bakery, which does not make anything with nuts, makes a carrot cake, that cake must be nut-free.

Choice C is the correct answer.

Kinshook · Answer

All of the desserts purchased last Friday for the Avery party were purchased from Kelsey’s Bakery. None of the desserts made at Kelsey’s Bakery contain nuts. This limitation therefore places some restrictions on the types of desserts made at Kelsey’s Bakery. For example, no traditional baklavas are made without nuts, and most traditional baklavas are made with walnuts. Last week, Kelsey’s Bakery made spice cakes, but none of the desserts purchased last Friday were spice cakes.

If the above statements are true, each of the following must also be true EXCEPT

No traditional baklavas are made without nuts, and most traditional baklavas are made with walnuts. None of the desserts made at Kelsey’s Bakery contain nuts. 
If Kelsey’s Bakery makes baklava, then that baklava is not traditional baklava.
MUST BE TRUE

All of the desserts purchased last Friday for the Avery party were purchased from Kelsey’s Bakery.
Last week, Kelsey’s Bakery made spice cakes, but none of the desserts purchased last Friday were spice cakes.
The Avery party did not purchase spice cakes from Kelsey’s Bakery last Friday.
MUST BE TRUE

All of the desserts purchased  last Friday  for the Avery party were purchased from Kelsey’s Bakery. 
None of the desserts made at Kelsey’s Bakery contain nuts.
None of the desserts purchased  last Friday  for the Avery party contain nuts.
But there may be desserts purchased on days  other than last Friday  for the Avery Party which  could have contained nuts. 
NOT ALWAYS TRUE

Last week, Kelsey’s Bakery made spice cakes. None of the desserts made at Kelsey’s Bakery contain nuts.
Some spice cakes do not contain nuts.
MUST BE TRUE

None of the desserts made at Kelsey’s Bakery contain nuts.
Kelsey’s Bakery does not make carrot cakes unless those carrot cakes are nut-free.
MUST BE TRUE

IMO C

GautamKhanduja · Answer

(A) If Kelsey’s Bakery makes baklava, then that baklava is not traditional baklava.
True "no traditional baklavas are made without nuts"

(B) The Avery party did not purchase spice cakes from Kelsey’s Bakery last Friday.
True "Last week, Kelsey’s Bakery made spice cakes, but none of the desserts purchased last Friday were spice cakes." and all cakes purchased last friday were from Avery.

(C) None of the desserts purchased for the Avery party contain nuts.
Maybe. We know only those purchased on friday do not contain nuts

(D) Some spice cakes do not contain nuts.
True, Because Kelssey's make only those cakes that do not contain nuts and they did make spice cakes

(E) Kelsey’s Bakery does not make carrot cakes unless those carrot cakes are nut-free.
True, Because Kelssey's make only those cakes that do not contain nuts

So option C

HarshaBujji · Answer

If the above statements are true, each of the following must also be true  EXCEPT

We need to observe a few key points
1) All of the desserts   purchased   last Friday   for the  Avery party  were purchased from  Kelsey’s Bakery.

Last Friday is an important key word. They could have purchased the deserts for A.party on Saturday or someother day.

(A)  If Kelsey’s Bakery makes baklava,  then that baklava is not traditional baklava. Yeah it true 
(B) The Avery party did not purchase spice cakes from Kelsey’s Bakery last Friday. Yeah true, Clearly mentioned:none of the desserts purchased last Friday were spice cakes.  
(C)  None of the desserts purchased for the Avery party  contain nuts.  We are not sure about all the deserts at A's party. We only have info about their Friday purchase.

(D) Some spice cakes do not contain nuts. Yeah true, hence they are baked in this bakery 
(E) Kelsey’s Bakery does not make carrot cakes unless those carrot cakes are nut-free. Yeah true.

IMO C

Sushen · Answer

All of the desserts purchased last Friday for the Avery party were purchased from Kelsey’s Bakery. None of the desserts made at Kelsey’s Bakery contain nuts. This limitation therefore places some restrictions on the types of desserts made at Kelsey’s Bakery. For example, no traditional baklavas are made without nuts, and most traditional baklavas are made with walnuts. Last week, Kelsey’s Bakery made spice cakes, but none of the desserts purchased last Friday were spice cakes.

If the above statements are true, each of the following must also be true EXCEPT

(A) If Kelsey’s Bakery makes baklava, then that baklava is not traditional baklava.
(B) The Avery party did not purchase spice cakes from Kelsey’s Bakery last Friday.
(C) None of the desserts purchased for the Avery party contain nuts.
(D) Some spice cakes do not contain nuts.
(E) Kelsey’s Bakery does not make carrot cakes unless those carrot cakes are nut-free.

Interpret:
MBT question, EXCEPT...
All of the answers MBT except one of them. One of the answers may have a situation in which it may not be true.

A. From the passage None of the desserts made at Kelsey’s Bakery contain nuts."
Translated to a diagram with conditional logic dessert @ Kelsey's Bakery -----> NO nuts ("None" is a negative sufficient)
Other statements: traditional Baklava -----> WITH nuts ("no" is a negative sufficient.)
 No nuts -----> NOT traditional Baklava (Contrapositive)
SOooooo A ---> B ---> C; or A ---> C  Dessert @ Kelsey's Bakery -----> NOT traditional Baklave 
Through Syllogism, A IS a MBT and is NOT the EXCEPT.

B. "none of the desserts purchased last Friday were spice cakes." purchased last Fri (@ Kelsey's) -----> NOT Spice Cake.
So it is a MBT that "The Avery party did not purchase spice cakes from Kelsey’s Bakery last Friday."
This is NOT the EXCEPT.

C. From the passage we have dessert @ Kelsey's Bakery -----> NO nuts 
and (first sentence) Dessert purchased on Friday for the Avery party -----> From Kelsey's Bakery 
BUT, there is no mention that ALL desserts purchased for the Avery party are purchased on Friday or that all were purchased from Avery's Bakery.
It is possible, therefore, that some of the desserts purchased for the Avery party contain nuts.
C appears to be the EXCEPTION!
Let's check the others!

D. From the passage: "Kelsey’s Bakery made spice cakes." It is reasonable to determine that spice cakes are a dessert, and from the passage: dessert @ Kelsey's Bakery -----> NO nuts ("None" is a negative sufficient)
So, it is clear that "Some spice cakes do not contain nuts" as stated in the answer. This is NOT the EXCEPT.

E. Again, from the passage: dessert @ Kelsey's Bakery -----> NO nuts ("None" is a negative sufficient)
Carrot cakes are clearly a dessert.
According to the answer (unless is a negative necessary), Kelsey's Bakery makes carrot cake -----> nut free.
This is clearly NOT the EXCEPT.

Indeed, C is the answer!

Lizaza · Answer

The problem doesn't seem to difficult, but we have to be really attentive to details. Let's deal with each statement separately:

(A) If Kelsey’s Bakery makes baklava, then that baklava is not traditional baklava. 
 No traditional baklavas are made without nuts, and Kelsey's doesn't use nuts - therefore, yes, the can only make nut-free one.   TRUE.

(B) The Avery party did not purchase spice cakes from Kelsey’s Bakery last Friday. 
 On Friday, Kelsey's sold no spice cakes - therefore, the Avery party couldn't possibly buy them.   TRUE.

(C) None of the desserts purchased for the Avery party contain nuts. 
 We know that none of the Kelsey's desserts contain nuts, and all purchases for the Avery party where made there - HOWEVER, only 'last Friday' shopping is guaranteed to have taken place at Kelsey's. We don't know whether on any other days any other desserts were bought from somewhere else for the party - therefore, there may well be nuts!   DOESN'T HAVE TO BE TRUE.

(D) Some spice cakes do not contain nuts. 
 Kelsey's doesn't use nuts, and they still made some spice cakes - therefore, indeed, some spice cakes are nut-free.   TRUE.

(E) Kelsey’s Bakery does not make carrot cakes unless those carrot cakes are nut-free. 
 Kelsey's doesn't use nuts - therefore, they'll have to make carrot cakes without nuts as well.   TRUE.

sanjitscorps18 · Answer

(A) If Kelsey’s Bakery makes baklava, then that baklava is not traditional baklava.
--> True. Kesley is NO nuts shop and traditional baklava has nuts

(B) The Avery party did not purchase spice cakes from Kelsey’s Bakery last Friday.
--> True. Spice cakes were not sold last Friday

(C) None of the desserts purchased for the Avery party contain nuts.
 --> Doubtful. Only the desserts at Avery's party that were purchased   last Friday   were from Kesley's . The desserts could have been purchased from elsewhere during other days of the week.

(D) Some spice cakes do not contain nuts.
--> True. Kesley's shop makes spice cakes hence some of them must be nut-free

(E) Kelsey’s Bakery does not make carrot cakes unless those carrot cakes are nut-free.
--> True. Since Kesley's bakery is a NO-nut shop this would be true as well

IMHO Option C

Ver23 · Answer

Dear  GMATNinja   KarishmaB

Quiet a bit of us have selected D. but the correct one is C, could u please explain this one.
Thanks.

KarishmaB · Answer

Option (C) is not necessarily true.

(C) None of the desserts purchased for the Avery party contain nuts.

Argument - "All of the desserts purchased  last Friday  for the Avery party were purchased from Kelsey’s Bakery."
What if some desserts were purchased on Thursday from another bakery for the Avery party? Or on Saturday if Avery party was on Saturday?
Hence, option (C) is not necessarily true.

(D) Some spice cakes do not contain nuts.

We are given in the argument:
- None of the desserts made at Kelsey’s Bakery contain nuts. 
- Last week, Kelsey’s Bakery made spice cakes.

Hence, we can say that some spice cakes (like the ones made by Kelsey's Bakery last week) do not contain nuts.
Option (D) is necessarily true.

Logxn97 · Answer

Hi  KarishmaB  ,

I posted this earlier but didn't get any reply so I'm asking again:

Although I agree with the explanation for the other options, I feel like there's an ambiguity for option D. The given paragraph states that Kelsey's bakery "made" spice cakes last week. Option D states "Some spice cakes do not contain nuts" which is written in present tense. Although spice cakes that didn't contain nuts were made last week, we don't know about their state in the present. We also don't know that the bakery regularly makes them of if it was just last week. So without knowing if Kelsey's bakery made spice cakes this week, and without any information about the state of last week's cakes, we don't know anything about spice cakes that don't contain nuts this week. So the option that's written in present tense, need not be true in my opinion.

Can you check and confirm this line of reasoning?

gmatophobia · Answer

Present tense is also used to represent general facts.

In this context, the statement - "Some spice cakes do not contain nuts" - represents a fact.

This is true.

Reason: If Spice cakes always contained nuts , Kelsey's bakery would not been able to make spice cakes.

sayan640 · Answer

KarishmaB  ,  MartyMurray 
Is this question a legit one? How will we know that Avery party is also held on other days of the week ? We were talking about Avery party on Friday. The correct option C considers other days of the week. I am totally clueless.

Posted from my mobile device

KarishmaB · Answer

The question is fine.

"All of the desserts purchased last Friday for the Avery party were purchased from Kelsey’s Bakery."

The desserts were purchased last Friday for the Avery party. The party could very well have been on Saturday or Sunday etc. We are not talking about Avery party held on Friday. We are talking about the purchases made on Friday for the Avery party (which could have been held on another day). Purchases for the party could have been made on Saturday too. We often prepare for quite a few days before a big party, right?

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