Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized for You

we will pick new questions that match your level based on your Timer History

Track Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

Re: If 4 < A < 6, n and m are positive integers with n > m, and T = A x 10 [#permalink]

Show Tags

28 Dec 2016, 23:12

1

This post received KUDOS

Top Contributor

1

This post was BOOKMARKED

Hi Samprits,

When dealing with a DS question it is important that you use all pieces of information provided both in the question stem as well as the statement.

We know that 4 < A < 6 and n and m are integers. To find the value of T we need the value of A and the value of n since T = A * 10n.

Statement 1 : (A * 10^m)^0.5 = 23100

Squaring both sides we get (A * 10^m) = (23100)^2 ------> (A * 10^m) = (23100 * 23100) ------> A = (23100 * 23100)/10^m

Now since A needs to be between 4 and 6, we need A to be 2.31 * 2.31, since 2.31 * 2.31 is the only possible product which gives us a value of A between 4 and 6. So the value of m which gives us A as 2.31 * 2.31 is 8.

However statement 1 does not give us any information about n. Insufficient.

Statement 2 : n - m = 7

Here we can have multiple values for n and m and do not have any information about A. Insufficient.

Combining statements 1 and 2

We have A = 2.31 * 2.31, m = 8 and since n - m = 7, n has to be 15. Sufficient.

Re: If 4 < A < 6, n and m are positive integers with n > m, and T = A x 10 [#permalink]

Show Tags

28 Dec 2016, 23:51

I have a question about the the information presented in the question. In particular this, " 4 < A < 6 "

Am I right in assuming that we cannot consider the value of A to be 5 because the question has not stated whether or not A is an integer. It could be 4.8, 5 or 5.3, too, right?

I got the correct answer as 'C' for this question, but the question I presented above is something I am curious about.