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If 5.7 of a region is shaded, then 94.3% of the region is not shaded. This can be calculated by subtracting the shaded percentage from 100%.
It depends on what the shaded and non-shaded parts look like!
3/10 are shaded.
2/3 is not shaded; 2/3 is about 66.667%.
If one fifth of a region is not shaded then 4 fifths of the region is shaded. Fifths means there are five parts.