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:

When We are saying that rate of change is constant, then we can't multiply by values. Here the approach could have been

Since we know that rate of change of R / Rate of change of S = 0.6.

(R3-6) /(S3-6) = 0.6 should also be true. and also

(R3-24)/(S3-60) =0.6 be true.

Here R3,S3 are unknown and 100 respectively.

If we solve any of the two above R3 comes as 48. This is based on assumption that Rate of change remains constant and R & S has a linear relation. If you assume that R ans S vary as their squares. We'll have foll. 2 eqns.
6^2a + b = 30
and 24^2a + b = 60.

Then for S=100, R = 36.

Hence, I think we are missing something in this question.

Two measuring scales R and S. When R is 6, S is 30 ; when R is 24, S is 60. How much is R when S is 100?

thanks praetorian

This is an absurd question. First of all, there is no reason or justification to assume, based on the wording of the problem, that any relationship exists whatsoever between R and S. For all we know, these could be random numbers.

Even if we assume that there is, in fact, some relationship between R and S, there are an INFINITE number of equations that can relate R and S based on a sample set of TWO and no reason or justification to assume that the relationship is linear.
_________________

Best,

AkamaiBrah Former Senior Instructor, Manhattan GMAT and VeritasPrep Vice President, Midtown NYC Investment Bank, Structured Finance IT MFE, Haas School of Business, UC Berkeley, Class of 2005 MBA, Anderson School of Management, UCLA, Class of 1993