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

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

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New post 24 Oct 2018, 00:47
1
2
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A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

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

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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.

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

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New post 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
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To understand the Population Density (Population divided by area), in  [#permalink]

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New post 25 Oct 2018, 06:29
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The answer is E.
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!
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To understand the Population Density (Population divided by area), in   [#permalink] 25 Oct 2018, 06:29
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