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In a swimming pool 20 meters long, 8 meters wide and 1.5 meters deep, tiles are pasted. The side length of a square tile is 5 decimeters. How many tiles do you need?
5 decimeter = 0.5 meter [(20 × 8 + 20 × 1.5 + 8 × 1.5) × 2-20 × 8] / (0.5 × 0.5) = [(160 + 30 + 12) × 2-160] / (0.25) = (202 × 2-160) / (0.25) = (404-160) / (0.25 = 244 ／ 0.25 = 976 pieces) a: 976 pieces of this kind of ceramic tile are required
There is a swimming pool, which is 25 meters long, 12 meters wide and 1.4 meters deep. The bottom and sides of the pool are lined with square white tiles with a length of 2 decimeters. How many pieces do you need in total?
2 decimeters = 0.2 meters, tile area: 25 × 12 + 25 × 1.4 × 2 + 12 × 1.4 × 2, = 300 + 70 + 33.6, = 403.6 (square meters); area of each tile: 0.2 × 0.2 = 0.04 (square meters); number of tiles required: 403.6 △ 0.04 = 10090 (pieces); answer: a total of 10090 pieces
There is a swimming pool, which is 25 meters long, 12 meters wide and 1.4 meters deep. The bottom and sides of the pool are lined with square white tiles with a length of 2 decimeters. How many pieces do you need in total?
2 decimeters = 0.2 meters, tile area: 25 × 12 + 25 × 1.4 × 2 + 12 × 1.4 × 2, = 300 + 70 + 33.6, = 403.6 (square meters); area of each tile: 0.2 × 0.2 = 0.04 (square meters); number of tiles required: 403.6 △ 0.04 = 10090 (pieces); answer: a total of 10090 pieces
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