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Problem-7 (Tree Structure)

An airline company wants its data to be transferred to its marketing partners in two files rather than one file for every simple table. The company decides on the following format to describe its assets and services in two structures. Tab 1 describes its assets and Tab 2 describes its services.
 
Tab 1: Airlines Information

<Air Lines>
     <Airline Code = AA>
        <Airline Name>American Airlines</Airline Name>
         <Currency>USD</Currency>
         <Connections >
            <Connection ID>0017</Connection ID>
            <Plane Type>A684</Plane Type>

 

            <Connection ID>0064</Connection ID>
            <Plane Type>A310-300</Plane Type>
         </Connections >
     </Airline Code = AA>

 

    </AA>
    <Airline Code = AI>
       <Airline Name>Air India</Airline Name>
       <Currency>INR</Currency>
         <Connections >
            <Connection ID>0555</Connection ID>
            <Plane Type>A319</Plane Type>

 

            <Connection ID>0788</Connection ID>
            <Plane Type>DC-10-10</Plane Type>
         </Connections >
    </Airline Code = AI>

 

</Airlines>

 
Tab 2: Flight Schedule

<List of Connections >
    <Connection ID>0017</Connection ID>
    <CityFrom>New York</CityFrom>
    <CityTo>New Delhi</CityTo>
    <Connection ID>0064</Connection ID>
    <CityFrom>San Francisco</CityFrom>
    <CityTo>New York</CityTo>
    <Connection ID>0555</Connection ID>
    <CityFrom>Rome</CityFrom>
    <CityTo>Frankfurt</CityTo>
    <Connection ID>0788</Connection ID>
    <CityFrom>Rome</CityFrom>
    <CityTo>Tokyo</CityTo>

 

 </List of Connections >

  1. Which of the following plane types start from Rome and San Francisco?
Rome San Francisco  
A684
A310-300
A319
DC-10-10
A380

Solution-7 (Tree Structure)

Note: Tree structure is one of the ways of presenting data. You just have to catch up with the structure to read the data. If you were able to read the data from the tree structure, you can be confident you will be able to interpret data from any other data structure that could appear on the GMAT.
  1. The Airlines structure in the Tab 1 should look like
Airlines Information
 

Airline Code

Airline Name

Currency

Connections Descriptions

 

Connection IDs

Plane Type

AA

American Airlines

USD

0017

A684

0064

A310-300

AI

Air India

INR

0555

A319

0788

DC-10-10

 

And the Flight Schedule Information in Tab 2 should look like

List of Connections
 

Connection ID

City From

City To

0017

New York

New Delhi

0064

San Francisco

New York

0555

Rome

Frankfurt

0788

Rome

Tokyo

 
Note: The links between the Tables is the field “Connection ID” which we use to integrate the data presented.

From Tab 2, the Connection IDs available from Rome are 0788 and 0555. The corresponding plane types from Tab 1 are A319 and DC-10-10, respectively.

 
From Tab 2, the connection IDs available from San Francisco is only 0064, and the corresponding plane type from Tab 1 is A310-300.
 
The answer must look like
 
Rome San Francisco  
A684
A310-300
A319
DC-10-10
A380

 

Note: Remember that Math problems in Integrated Reasoning are mainly about relating protocols.
 
For example, a data representation called “tables” that we have been fond of has a protocol that says you can relate things in a row or column. A graph is a protocol that says look above the x-axis to find corresponding relation with the y-axis. Similarly, a xy-plottera pie-diagram, and other forms of representing data have protocols that explain how to understand them. The format in the above problem is just one such protocol that structures information.




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