The floor of a room needs 500 pieces of square bricks with a side length of 4 decimeters. If the floor is paved with square bricks with a side length of 5 decimeters, how many pieces do you need

The floor of a room needs 500 pieces of square bricks with a side length of 4 decimeters. If the floor is paved with square bricks with a side length of 5 decimeters, how many pieces do you need

Use an inverse example to solve the problem
Area of a brick × number of bricks = room area (certain)
If the floor is paved with square bricks with a side length of 5 decimeters, X pieces are required
5×5×x=4×4×500
x=4×4×500÷（5×5）
x=320
Answer: if the floor is paved with square bricks with a side length of 5 decimeters, 320 pieces are needed