This is a segmentation blowup chart. By "blowup" we're really talking about zooming in. One particular segment is zoomed in really close so we can see the different subdivisions of that part of the segmentation chart.
We see that the numbers represent percentages because of the label "Total (%)" with a 100 next to it. So the 4 segments add up to 100%.
Those 4 segments of land are: arable, grassland, wooded, and arid/desert. The arable portion makes up 13% of the 100% represented. And that 13% is further subdivided according to the segments illustrated in the chart.
In terms of quantity, that 100% represents 487 million acres of land.
The sub-segmented portion (Arable land) is the 13% of that 487M acres that is further divided into two major categories: cultivated and non-cultivated. 39% of that portion is non-cultivated while the remaining majority is cultivated land.
We also know from the char that 63 million acres of the 487 million acres was labeled as Arable. So a segmented blowup chart gives you a good overview of what the overall picture looks like.
You know the size of the overall land we are talking about and you also can magnify a specific portion for further information.
source: GMAT Pill - Segmented Blowup Chart
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