It needs 480 pieces of square tiles with side length of 0.4m to lay the floor of a living room. If it is changed to square tiles with side length of 0.6m, how many pieces do it need?

It needs 480 pieces of square tiles with side length of 0.4m to lay the floor of a living room. If it is changed to square tiles with side length of 0.6m, how many pieces do it need?

0.4×0.4×480/0.6×0.6=214