GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 19 Oct 2019, 16:27

### GMAT Club Daily Prep

#### 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

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

# To understand the Population Density (Population divided by area), in

Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 58445
To understand the Population Density (Population divided by area), in  [#permalink]

### Show Tags

24 Oct 2018, 00:47
1
2
00:00

Difficulty:

55% (hard)

Question Stats:

66% (01:29) correct 34% (01:36) wrong based on 32 sessions

### HideShow timer Statistics

To understand the Population Density (Population divided by area), in persons per square kilometers, of a country, the population and the total area, in square kilometers, were estimated. Both the estimates had their lower and upper limits. Was the Population Density for the country greater than 500 persons per square kilometers?

(1) The upper limit for the estimate of the population was 50 million persons.
(2) The upper limit for the estimate of the total area was 90,000 square kilometers.

_________________
Senior Manager
Joined: 15 Feb 2018
Posts: 367
To understand the Population Density (Population divided by area), in  [#permalink]

### Show Tags

25 Oct 2018, 05:50
1
Need population density.
Need population density or population and area.

x>500/$$km^2$$

Be careful of units - kilometres, metres etc

1) upper limit is the top of the range.
0≤number of people≤50,000,000
Could be 0/$$km^2$$
Could be 50,000,000/$$km^2$$
Insufficient

2)upper limit is the top of the range
0≤total area≤90,000$$km^2$$
Could be 0/$$km^2$$
Could be 999/$$km^2$$
Insufficient

Together we have two ranges
0 people/90,000$$km^2$$ through to 50,000,000/$$km^2$$
Insufficient

E
examPAL Representative
Joined: 07 Dec 2017
Posts: 1153
To understand the Population Density (Population divided by area), in  [#permalink]

### Show Tags

25 Oct 2018, 06:29
1
This question can be solved using the Logical approach - no calculations necessary.
As the question stem tells us to calculate population density, we need population and total area. 1) and 2) both relate to only one of these two - clearly insufficient.
What about combining them? Well, if 1 and 2 gave us the actual numbers, this would be enough. however, they don't - they only give an upper limit - meaning both numbers can be an infinite number of smaller values. no way to find the population density, or what its minimum is!
_________________
To understand the Population Density (Population divided by area), in   [#permalink] 25 Oct 2018, 06:29
Display posts from previous: Sort by