Source: Official Guide for the GMAT 12th Ed. Section 5.3 Problem Solving; #116

2

Each in the mileage table above represents

Each in the mileage table above represents an entry indicating the distance between a pair of the five cities. If the table were extended to represent the distances between all pairs of 30 cities and each distance were to be represented by only one entry, how many entries would the table then have? 60, 435, 450, 465, 900

2 Explanations

1

Maria Segal

Lets solve it for 5*5 chart: we have 25 slots in the table, some of them are empty and some have entries. We can draw a diagonal that divides the table in half - and we see that a less than half the table has entries. Same would be with the 30*30 table: it would contain a bit less than half of 900 entries - a bit less than 450. The only answer that fits this criteria is B.

Jun 20, 2014 • Comment

3

Gravatar Mike McGarry, Magoosh Tutor

Nov 6, 2012 • Comment

Add Your Explanation

You must have a Magoosh account in order to leave an explanation.

Learn More About Magoosh

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 5.3 Problem Solving

Improve Your Score

Magoosh GMAT is an affordable online course for studying the GMAT.

Learn More About Magoosh

Share Post

Email

Facebook