how many vinyl tiles are needed to tile a kitchen measuring 10 1/2ft by 18ft if the tiles equal 25cm on each side

2 answers

1 ft = 30.48 cm

10 1 / 2 ft = 10.5 * 30.48 = 320.04 cm

18 ft = 18 * 30.48 = 548.64 cm

320.04 * 548.64 ) / ( 25 * 25 ) =

175586.7456 / 625 = 280,93879296
Your answer of 280.9 tiles might work if all the scraps could be fitted together as needed. However, if we assume that no scrap can be reused, then

10.5 ft = 320 cm = 13 tiles wide
18 ft = 548cm = 22 tiles long

So, a better estimate would probably be 13*22 = 286 tiles.

Naturally, if some scraps could be made to fit in, then the true usage would be between 281 and 286