I27-03

Question

At a Halloween-themed event, a group of guests attended a party where each guest wore a costume of one of the types listed in the table. The guests were offered different types of Halloween treats, including candy, apple cider, and pumpkin pastries. Each guest was allowed to choose only one type of treat, and the table below summarizes the treat preferences for the listed costume types only.
       Costume Type      Number of Guests      Chose Candy (%)      Chose Apple Cider (%)      Chose Pumpkin Pastry (%)        Witch    15    40%    20%    40%       Vampire    12    50%    25%    25%       Zombie    20   30%   40%   30%       Ghost    10    10%    50%    40%       Skeleton   8    25%    25%    50%

Select  Yes  if the question can be answered from given info. Otherwise, select  No .

Bunuel · Answer

Official Solution:

We are asked to check which statements can be answered using the given info.
 
 Statement 1: 
 
Number of guests who chose candy = number of witches who chose candy + number of vampires who chose candy + number of zombies who chose candy + number of ghosts who chose candy + number of skeletons who chose candy = 15*0.4 + 12*0.5 + 20*0.3 + 10*0.1 + 8*0.25 = 21. So, this question can be answered.
 
 Statement 2: 
 
The new percentage of zombies choosing apple cider would be 40% + 10% = 50%. So, this question can be answered.
 
 Statement 3: 
 
There is no information in the table or stem about the gender of any guests. The chart only gives costume type, number of guests, and their treat preference. Since gender is not mentioned anywhere, we cannot determine how many candy-choosing guests were female.

Correct answer:

What is the total number of guests who chose candy as their Halloween treat?  "Yes"

If 10% of the zombies decide to switch from a pumpkin pastry to apple cider instead, what would be the new percentage of zombies choosing apple cider?  "Yes"

How many of the guests who chose candy were female?  "No"

SR4896 · Answer

Query 1: When each guest had a unique costume, How could the no of guests with a particular costume type be more than 1?
Query 2: Incase there is another custume type namely A, answer to the question "  total number of guests who chose candy as their Halloween treat" cannot be determined.

Bunuel · Answer

The question has now been updated to remove the ambiguity you mentioned. Thank you!

Kajalj · Answer

Bunuel , I assumed that table mentioned only the preference for listed costume types and thus we don't have full information for "Total No. of guests who chose candy"; can you please clarify If I understood anything incorrectly ?

This got more firmly strengthened by 3rd question asking for preference of treat of superhero costume which means that there were other type of costumes as well!

Bunuel · Answer

Your first assumption is not correct. The stem clearly states:

" Each  guest wore a costume  of one of the types listed  in the table."

This means that all guests at the event are represented in the table, and there are no other costume types beyond those five listed. So we do have full information to calculate the total number of guests who chose candy.

As for your second point, the confusion caused by the superhero costume in Statement 3, that’s been resolved. Statement 3 has now been updated to ask something that genuinely cannot be answered based on the provided data.

I27-03

Prep Toolkit

Top 5 GMAT Debrief Videos

615 to 715 in 15 Days (Ria's Strategies)

More than Quant/Verbal Abilities: Speed vs. Accuracy

745 with Only Self-Prep and GMAT Club

From 555 to 765: 210-point Improvement

Perfect 805 Score Debrief by Julia

My Rewards

Costume Type	Number of Guests	Chose Candy (%)	Chose Apple Cider (%)	Chose Pumpkin Pastry (%)
Witch	15	40%	20%	40%
Vampire	12	50%	25%	25%
Zombie	20	30%	40%	30%
Ghost	10	10%	50%	40%
Skeleton	8	25%	25%	50%