The school meeting room needs to be paved with floor tiles. It needs 1600 pieces of 30 cm long square bricks. If it needs to be paved with 40 cm long square bricks, how many pieces?

The school meeting room needs to be paved with floor tiles. It needs 1600 pieces of 30 cm long square bricks. If it needs to be paved with 40 cm long square bricks, how many pieces?

Hello:
30×30×1600÷(40×40)
=900 (pieces)