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A swimming pool is 80 meters long, 30 meters wide and 3 meters deep. How many tiles do you need if each tile is 3 square decimeters
First unify the unit, and change the meter into decimeter. The length is 800 decimeters, the width is 300, and the depth is 30
Bottom: 800x300 = 240000 square decimeters;
Long side: 800x30 = 24000 square decimeters;
Short side: 300x30 = 9000 square decimeters;
Total area = bottom + long side x2 + short side x2 = 240000 + 24000x2 + 9000x2 = 306000
Ceramic tile: 306000 / 3 = 102000
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