If one fifth of a region is not shaded then 4 fifths of the region is shaded. Fifths means there are five parts.
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It is difficult to say since there is no image and it is not clear what part is shaded. But, if there is a circle with a 12 metre diameter which contains two equal circles which are as large as possible, then the shaded area is probably 56.55 square metres.
The unshaded region is 5/28ths of the rectangle.Shaded is 4/7 + 1/4 = 16/28 + 7/28 = 23/28
16% is one tenth shaded in a graph
The answer is 15. One fifth of 12,000 is 600. One quarter of 600 is 150. One tenth of 150 is 15 !
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