A rectangular swimming pool is 25 m long and 10 m wide. Tiles are placed all around the edge of the pool (perimeter). Each tile is 1 m long. How many tiles are needed?
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Worked Solution
Step 1: Tiles go around the edge, so find the perimeter.
Step 2: Perimeter = 2 x (length + width) = 2 x (25 + 10) = 2 x 35 = 70 m.
Step 3: Each tile is 1 m long, so number of tiles = 70 ÷ 1 = 70.
70 tiles are needed.
Correct answer: 70
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