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Expert reply on cr

This topic has 2 expert replies and 2 member replies
sagarock Senior | Next Rank: 100 Posts
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Expert reply on cr

Post Mon Aug 15, 2016 9:05 am
Transportation expenses accounted for a large portion of the total dollar amount spent on trips for pleasure by residents of the United States in 1997, and about half of the total dollar amount spent on the transportation was airfare. However, the large majority of United States residents who took trips for pleasure in 1997 did not travel by airplane but used other means of transportation.

If the statements above are true, which of the following must also be true about United States residents who took trips for pleasure in 1997?

A) Most of those who traveled by airplane did so because the airfare to their destination was lower than the cost of other available means of transportation.
B) Most of those who traveled by airplane did so because other means of transportation to their destinations were unavailable.
C) Per mile traveled, those who traveled by airplane tended to spend more on transportation to their destination than did those who used other means of transportation.
D) Overall, people who did not travel by airplane had lower average transportation expenses than people who did.
E) Those who traveled by airplane spent about as much, on average, on other means of transportation as they did on airfare
Any expert why d is correct answer ,although i agree rest all answers can be eliminated but d is not at all best.for ex-even if people travel by other means ,what guarantees they travel by cheap transportation may be most who drop the idea by plane travel by five star cruise,this will inflate the average.I find this inference very subjective and below standard.Kindly help

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Marty Murray Legendary Member
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Post Wed Aug 17, 2016 6:24 am
sagarock wrote:
David sir and Mitch sir, but i have a silly doubt.say for example out of total 100 50 travelled by airplane and other 50 by other means .but when they choose others what guarantees it will bring average down.for instance out of 50 air flyers 40 used 5 star cruise and other 50 non flyers used normal means and 10 as you say of airplanes.so a.m will infact increase because of 5 star cruise expense instead of declining.why we need to assume they will switch to cheaper transportation Sad.kindly clear this doubt
To get CR questions right, you have to see key details.

What you have to see to get this question right is that the cost of other transportation has already been constrained by the following statements in the prompt.

about half of the total dollar amount spent on the transportation was airfare.

This statement indicates that half of the money spent was spent on airfare, and the so the other half, AN AMOUNT EQUAL TO THE AMOUNT SPENT ON AIRFARE, was spent on other forms of transportation.

the large majority of United States residents who took trips for pleasure in 1997 did not travel by airplane but used other means of transportation.

This statement indicates that more people used other forms of transportation than used air travel.

Those statements guarantee that the average cost of other forms of transportation was lower.

The same amount of money was spent on both forms, but more used other forms than used airplanes.

So whatever people chose, those who chose other forms must have spent less, on average, per person.

Here it is mathematically.

Amount of Money Spent On Each Type: M

Number of People Using Air Transport: A

Number of People Using Other Means: O

Average Spent On Air Transport: M/A

Average Spent On Other Transport: M/O

A < O

M/A > M/O

_________________
Marty Murray
GMAT Coach
m.w.murray@hotmail.com
http://infinitemindprep.com/
In Person in the New York Area and Online Worldwide

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sagarock Senior | Next Rank: 100 Posts
Joined
11 Apr 2016
Posted:
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Post Wed Aug 17, 2016 5:28 am
David sir and Mitch sir, but i have a silly doubt.say for example out of total 100 50 travelled by airplane and other 50 by other means .but when they choose others what guarantees it will bring average down.for instance out of 50 air flyers 40 used 5 star cruise and other 50 non flyers used normal means and 10 as you say of airplanes.so a.m will infact increase because of 5 star cruise expense instead of declining.why we need to assume they will switch to cheaper transportation Sad.kindly clear this doubt

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Top Member

Marty Murray Legendary Member
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129 members
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955
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Post Wed Aug 17, 2016 6:24 am
sagarock wrote:
David sir and Mitch sir, but i have a silly doubt.say for example out of total 100 50 travelled by airplane and other 50 by other means .but when they choose others what guarantees it will bring average down.for instance out of 50 air flyers 40 used 5 star cruise and other 50 non flyers used normal means and 10 as you say of airplanes.so a.m will infact increase because of 5 star cruise expense instead of declining.why we need to assume they will switch to cheaper transportation Sad.kindly clear this doubt
To get CR questions right, you have to see key details.

What you have to see to get this question right is that the cost of other transportation has already been constrained by the following statements in the prompt.

about half of the total dollar amount spent on the transportation was airfare.

This statement indicates that half of the money spent was spent on airfare, and the so the other half, AN AMOUNT EQUAL TO THE AMOUNT SPENT ON AIRFARE, was spent on other forms of transportation.

the large majority of United States residents who took trips for pleasure in 1997 did not travel by airplane but used other means of transportation.

This statement indicates that more people used other forms of transportation than used air travel.

Those statements guarantee that the average cost of other forms of transportation was lower.

The same amount of money was spent on both forms, but more used other forms than used airplanes.

So whatever people chose, those who chose other forms must have spent less, on average, per person.

Here it is mathematically.

Amount of Money Spent On Each Type: M

Number of People Using Air Transport: A

Number of People Using Other Means: O

Average Spent On Air Transport: M/A

Average Spent On Other Transport: M/O

A < O

M/A > M/O

_________________
Marty Murray
GMAT Coach
m.w.murray@hotmail.com
http://infinitemindprep.com/
In Person in the New York Area and Online Worldwide

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Thanked by: sagarock
sagarock Senior | Next Rank: 100 Posts
Joined
11 Apr 2016
Posted:
46 messages
Post Wed Aug 17, 2016 5:28 am
David sir and Mitch sir, but i have a silly doubt.say for example out of total 100 50 travelled by airplane and other 50 by other means .but when they choose others what guarantees it will bring average down.for instance out of 50 air flyers 40 used 5 star cruise and other 50 non flyers used normal means and 10 as you say of airplanes.so a.m will infact increase because of 5 star cruise expense instead of declining.why we need to assume they will switch to cheaper transportation Sad.kindly clear this doubt

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