A cuboid pool is 2 meters long and 1 meter wide. Now it is necessary to edge the pool all around and at the bottom 1 decimeter square tiles, then at least how many such tiles are needed?

A cuboid pool is 2 meters long and 1 meter wide. Now it is necessary to edge the pool all around and at the bottom 1 decimeter square tiles, then at least how many such tiles are needed?

2 meters = 20 decimeters
1 meter = 10 decimeters
What is the area of the tile
20 × 10 + (20 × 5 + 10 × 5) × 2 = 500 (square decimeter)
What is the area of the tile
1 × 1 = 1 (square decimeter)
Need tiles
500 △ 1 = 500 (pieces)

A cuboid pool is 8 decimeters long and 4 decimeters wide at the bottom. How many liters of water is needed to inject 2 decimeters deep into the empty pool?

Demand = 8 × 4 × 2 = 64 cubic decimeter = 64 liter

A pool can hold 15000 liters of water. The known water depth is 0.4 meters. The pool is 7.5 meters long and how many meters wide is it?

15000 liters = 15 cubic meters, 15 △ 0.4 △ 7.5 = 5 (meters). Answer: the width is 5 meters