Of the 1,000 companies responding to a certain survey, what percent in

Bunuel,

My question is that in Statement 1, no where its mentioned that remaining 80% had a plan. Is it right to assume in DS questions?

Actually no such assumption was made, it's a fact.

There are only two answers to the question "do you have a plan?":
YES.
NO.

If NO=800, then YES=1000-800=200. How else?

I think we can assume that all have responded as the question states "Of the 1,000 companies responding to a certain survey"

Guys, I'm new to this forum. For some reasons, I cannot see the last 3 options for all the questions posted in this forum. Pls suggest if I'm missing something? Thanks a ton

This is a data sufficiency question. Options for DS questions are always the same.

The data sufficiency problem consists of a question and two statements, labeled (1) and (2), in which certain data are given. You have to decide whether the data given in the statements are sufficient for answering the question. Using the data given in the statements, plus your knowledge of mathematics and everyday facts (such as the number of days in July or the meaning of the word counterclockwise), you must indicate whether—

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient to answer the question asked.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient to answer the question asked.
C. BOTH statements (1) and (2) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient to answer the question asked.
D. EACH statement ALONE is sufficient to answer the question asked.
E. Statements (1) and (2) TOGETHER are NOT sufficient to answer the question asked, and additional data specific to the problem are needed.

I suggest you to go through the following post ALL YOU NEED FOR QUANT.

Hope this helps.

How about: 200 of the companies did not indicate that they had a business recovery plan and 100 of the companies indicated that they did not have a business recovery plan.

Not sure I understand what you mean.

There are only two answers to the question "do you have a plan?":
YES.
NO.

If NO=800, then YES=1000-800=200. How else?

A typical survey will have 1 or more questions. The surveyee may choose not to reply to a survey question that is not mandatory.

When surveyee does not respond to the question then the case is "did not indicate that they had a business recovery plan"
When surveyee responds "No" to the question then the case is "indicated that they did not have a business recovery plan"

I do not intend to contest your solution since I see where you're coming from. But, DS questions do test for unsupported assumptions. Assumption that survey question was mandatory or every participant responded to the survey question, is not supported in the question stem. That is how I read the question. Maybe I'm wrong - at least by the rule that question-maker's answer is always right!

1- 200 no recovery plan-> 800 / 1000 = % of companies that had a bp recovery
2- recovery = 4(norecovery)
recovery + norecovery = 1000
you can set up system two equations and two unknowns

So answer should be D

I agree here. Since the Q asks: "what percent indicated that they had a business recovery plan?" And statement 1 says: 200 of the companies did not indicate., it can be read as if they did not indicate YES or NO; meaning they did not answer the Q. If this were a GMAT SC problem, it would be a meaning error from the original sentence/Q. The statement really should say: 200 companies INDICATED that they did not. ... not that they did not indicate. Again, the latter can be read as if they did not even answer the Q in the survey, which is why I chose E. The meaning error threw me off.

Of the 1,000 companies responding to a certain survey, what percent indicated that they had a business recovery plan?

(1) 200 of the companies did not indicate that they had a business recovery plan. Sufficient as we can find out the % from this

(2) The number of companies that indicated that they had a business recovery plan was 4 times the number that did not indicate that they had a business recovery plan. Sufficient as we can find out the % from this as well

D

I understand your meaning, but the question statement covers this.
There can be more than two responses to the survey, for instance;
1) Have a plan
2) intend to create a plan
3) do not have a plan

But statement 1 says; "did not indicate that they had a business recovery", meaning that all answers to the survey other then we have a plan are covered.
It's therefore safe to assume that the other 800 have a plan in place.
similarly statement 2 says did not indicate not stated that they don't have a plan.

I agree that all the companies responded. But, what if they indicated a response such as "We don't want to comment on our scenario of the business plan". Considering it is an official GMAC question, this could have been framed in a better sense!

Hope I am able to put through my point.

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.