Andy, George, and Sally are a team of consultants working on

Without looking at the reveal. I have to say that I think it is not possible for them to complete the project in 8 hours. Thus we can answer the question and the answer is C both statements are needed in combination to complete the answer. The limits of Sally's ability are between 11 and 27 hours solo. Georgia from 3 to 11 hours solo. Lastly Andy 5-13 hours solo. Additively they will not be able to finish the project in the alloted time.

I will check out the reveal and see if I was right.

Okay I checked out the reveal and I had it totally upside down. I added up the slowest limit of their work. This seems like a good idea but understanding that Georgia and Andy could do it themselves, (making statement #2 sufficient) was not a possibility that i had explored. Gotta stick to your system. First is #1 sufficient?, then # 2? then the combination? I just assumed that it had to be the combination since Sally was not addressed in #1. Good question.

Please explain..If statement 2 is sufficient why not statement 1?

Oh yeah, thats true, my mistake, it should have been 11 and 13, but anyway answer B will still hold.

Thanks mate

Guys, I am not a native speaker, yet for me 'will' in below sentence:
"If the team of three has to begin work now and no one else can work on this project, will Project Alpha be completed by the deadline?"
means there shall be a 100% guarantee the project will be completed.

However, both gents MAY NEED more than 8 hours to finish the projects, because their number of hours is flexible.

Therefore, for me this question appears as not worded correctly and the answer shall be E.

Alternatively, if we change the question to
"If the team of three has to begin work now and no one else can work on this project, IS THERE A POSSIBILITY for Project Alpha to be completed by the deadline?"
the answers will be B

Ans has to be B,
The slowest rate at which Georgia and Andy can work in 1 hr. is 8/15
In 8 hours, then can do almost 5 times the work

I couldn't get previous explanations and I found below with an example

Andy, George and Sally are a team of consultants working on Project Alpha. They have an eight hour deadline to complete the project. The team members work at constant rates throughout the eight hour period. If the team of three has to begin work now and no one else can work on this project, will Project Alpha be completed by the deadline?

1.Sally can finish the project alone in 4k + 7 hours, where k is a positive integer with a minimum value of 1 and a maximum value of 5.
2.Working alone, George will take 2k + 1 hours and Andy will take 3 + 2k hours, where k is a positive integer with a minimum value of 1 and a maximum value of 5

Statement 1 as you said is insufficient as we don't have any info about the rates of the other ppl.

From Statement two, Lets assume that a total of 143 pages need to be typed in 8 hrs. For andy and george, Lets assume that k=5 so Andy finishes 143 pages by himself in 13 hrs and George finishes 143 pages by himself in 11 hours.

Andy's Rate=143/13=11 pages/hr So in 8 hrs he will finish 88 pages
George's Rate=143/11=13 pages/hr so in 8 hrs he will finish 104 pages. So in 8 hrs if Andy and George alone can finish 192 pages, with Sally's help they'd we able to finish even more in 8 hrs over exceeding the target of 143 pages. Hence SUFFICIENT.

The wording in this question is really bad, and not at all GMAT-like. For one thing, there is no need to make k a variable in each statement (a real GMAT question would never do that; instead k would have a single fixed value within the range given - they'd say "where 1 < k < 5"). Then if you choose to combine the statements, because the letters have been turned into variables, it isn't at all clear if the k referred to in Statement 1 must have the same value as the k referred to in Statement 2.

Regardless, one can see why Statement 2 is sufficient fairly quickly. Even in the worst case, Georgia would take 11 hours alone, and Andy 13 hours. Two workers exactly like Andy would take 13/2 = 6.5 hours to do the job. Well, Georgia is faster than Andy, so one worker like Georgia and one worker like Andy must take less time than two workers like Andy, so Andy and Georgia together must take less than 6.5 hours. So even in the worst case, the job is certainly finished in less than 6.5 hours, and the answer is B.