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Question

A circular swimming pool is surrounded by a concrete walk 4 m wide If the area of the walk is 1125 that of the pool then the radius of the pool is_______
  1. 20 m
  2. 8 m
  3. 30 m
  4. 16 m

A
20 m
B
8 m
C
30 m
D
16 m
Solution
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