A circular swimming pool is surrounded by a concrete wall 4ft wide. If the area

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✪ Choose the correct option.

A circular swimming pool is surrounded by a concrete wall 4ft wide. If the area of the concrete wall surrounding the pool is 11/25 that of the pool, then the radius of the pool is?

A. 10ft
B. 20ft
C. 30ft
D. 40ft

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