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655-705 (Hard)|   Inference|   Must be True|                                 
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I have a few questions:
1.) On the sentence "and about half of the total dollar amount spent on transportation was for airfare"... I realize that this sentence is joined by a comma conjunction, but it leads me to ask...total dollar amount spent on what? I realize that it is "total dollar amount spent on trips for pleasure" based on the first sentence, but why does the second sentence get away with not specifying this? To me, it is vague. Am I missing a grammar rule here?
-To clarify, for Choice C, distance traveled is basically irrelevant because we care about total costs (e.g., who cares if you traveled 2 miles or 200,000 miles on plane vs. any other form of transport, there is still a greater spend on planes)? Also, to confirm, Choice C COULD BE TRUE... but it does not have to be, right?
-To clarify, Choice E cannot be true because basically this would not explain the difference in total spent (traveling by other forms than airplane would then have to be more than airplane spend because then you have the vast majority of people + the few that are spending the most on airplanes)?
Thank you!
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The given statements state that transportation expenses accounted for a large portion of the total amount spent on pleasure trips in the United States in 1997, with airfare representing about half of the transportation expenses. Additionally, it is mentioned that the large majority of residents who took pleasure trips did not use airplanes as their means of transportation.

Based on this information, we can conclude that:

(D) Overall, people who did not travel by airplane had lower average transportation expenses than people who did.

This conclusion can be drawn because the large majority of residents did not travel by airplane, implying that their transportation expenses, on average, would be lower compared to those who did use airplanes.
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AbdurRakib
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. Wrong - We are not asked to analyse why they traveled by airplane

(B) Most of those who traveled by airplane did so because other means of transportation to their destinations were unavailable. Wrong - as in A, we are not asked to analyse why they traveled by airplane

(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. Wrong - per mile traveled? we know nothing about distances

(D) Overall, people who did not travel by airplane had lower average transportation expenses than people who did. Correct - This is what we are looking for. If most people didn't travel by plane, but plane expenses were half of travel expenses, then plane expenses must be higher. This statement states the complement, NOT plane expenses, spend LESS on transportation expenses.

(E) Those who traveled by airplane spent about as much, on average, on other means of transportation as they did on airfare. Wrong - if the majority of the US did not travel by plane, but rather by other means of transportation, then transportation cost was cheaper than non-transportation cost - contradiction
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in passage itself, it is clearly mentioned that "about half of the total dollar amount spent on the transportation was airfare" this means option E "Those who traveled by airplane spent about as much, on average, on other means of transportation as they did on airfare" IS CORRECT.
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KarishmaB GMATNinja

Are there only 2 groups?
People who travelled by airplane and people who didn't travel by airplane

What about the third group = People who travelled by airplane but also took bus, train or boat so they are also contributing to transporatation expenses other than airfare, how to eliminate E in this case?
Why are we considering that people who travelled by airplane ONLY travelled by plane? How to derive this ONLY case from the passage?

Transporation cost = 100
Airfare = 50
Other means = 50

Number of people by airfare = 2
Other means = 7
Both - 1 (They are contributing to airfare and other means)

How the overall approach changes in this case?
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KarishmaB GMATNinja

Are there only 2 groups?
People who travelled by airplane and people who didn't travel by airplane

What about the third group = People who travelled by airplane but also took bus, train or boat so they are also contributing to transporatation expenses other than airfare, how to eliminate E in this case?
Why are we considering that people who travelled by airplane ONLY travelled by plane? How to derive this ONLY case from the passage?

Transporation cost = 100
Airfare = 50
Other means = 50

Number of people by airfare = 2
Other means = 7
Both - 1 (They are contributing to airfare and other means)

How the overall approach changes in this case?
­This is a must be true question. (E) is a possibility, but is it necessarily true?
We are not considering that people who travelled by airplane ONLY travelled by plane.
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