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Graphics Interpretation: IR question--Doubt

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Graphics Interpretation: IR question--Doubt [#permalink] New post 18 Jul 2012, 06:22
Hi All,

Could someone please explain how one needs to analyse the below listed IR question and also explain the logic behind the right answers ?

Thanks,

harikris
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Re: Graphics Interpretation: IR question--Doubt [#permalink] New post 19 Jul 2012, 04:14
The table on the left is the compelete timeline-chart.
The scale is too small to show in details the Pharenozoic Eon hence the one in the middle is a zoom on the Pharenozoic.
Again too small to see in details the Cenozoic, so the chart on the right is another zoon on that Era.
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Re: Graphics Interpretation: IR question--Doubt [#permalink] New post 19 Jul 2012, 06:58
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Last edited by carcass on 19 Jul 2012, 15:25, edited 2 times in total.
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Re: Graphics Interpretation: IR question--Doubt [#permalink] New post 19 Jul 2012, 07:56
Hi Carcass,

Apologies for not posting the answers. Now I attached the ans choices and the correct answers.


Thanks,

harikris
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Re: Graphics Interpretation: IR question--Doubt [#permalink] New post 19 Jul 2012, 09:00
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Ki karikris,

As is always the case with Graphics problems, we should read the text to help understand this image. Some questions can be answered without referencing the passage, but it's always easier to read first. And in this case, a single word--"magnification"--helps us understand the image. Those gray triangles marked off by dotted lines are telling us which part of the bar on the left is magnified by the bars moving right.

So, for the first question, the Miocene Epoch isn't in the same bar of the graph as any of the Eras. But looking at the magnification indicators, we can see that the entire rightmost graphic is expanded from the Cenozoic era. So, since the Miocene takes up about 25% of it's bar, it takes up about 25% of the Cenozoic Era of which it is part.

As for the second question, it asks for something about eons, eras, and periods--that puts us in graph 2. We're asking for the beginning of all three, which means we want a line straight across the graph. That's the Cambrian period, which starts the Phanerozoic Eon and the Paleozoic Era.

Good luck!
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Re: Graphics Interpretation: IR question--Doubt [#permalink] New post 19 Jul 2012, 19:17
Hi Eli,

Thanks a lot for providing the answer.

Thanks,

harikris
Re: Graphics Interpretation: IR question--Doubt   [#permalink] 19 Jul 2012, 19:17
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