The area of the shadow is 3 square decimeters, which is 1 / 8 of the area of the big circle and 1 / 5 of the area of the small circle It's better to write down the meaning of each step formula. Whoever writes it is the best answer

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Large circle area = 3 / (1 / 8) = 24
Small circle area = 3 / (1 / 5) = 15
Blank area = 24-3 + 15-3 = 33 square decimeters

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