Source: Official Guide for GMAT Review 2016 Data Sufficiency ; #92

1

What is the ratio of the average

What is the ratio of the average (arithmetic mean) height of students in class X to the average height of students in class Y?

1 Explanation

1

Danny Watts Jr

Statement 1: Avg height of X = 120. No info on Y, so INSUFFICIENT

Statement 2: Avg height of X and Y combined = 126. This is not sufficient to find the ratio because we aren't provided any info regarding the averages of the individual classes or the number of students in each class, so this is INSUFFICIENT.

Combined: We still don't have any information on the size of either class, which is needed in order to determine the approximate proportion between the two classes, so it is impossible to determine the ratio. ANSWER = E.

Jan 13, 2018 • Comment

David Recine, Magoosh Tutor

Another good one, Daniel. :)

Jan 15, 2018 • Reply

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Official GMAT Material

Official Guide for GMAT Review 2016

Official Guide for the GMAT 2015 14th Ed.

Official Guide for the GMAT 13th Ed.

Official Guide for the GMAT 12th Ed.

Revised GRE PDF 2nd Ed.


Section 6.3 Data Sufficiency

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