If he uses 85 tiles, 28 tiles will be black
<h3>Sequence and Pattern</h3>The formation of the tiles of the floor follows an arithmetic sequence or pattern
The pattern is given as:
- Blue
- White
- Black
Given that the total number of tile used is 85, and the black tile is always in the third position.
The highest number less than or equal to 85 that is divisible by 3 is 84.
Next, we divide 84 by 4
Hence, 28 of the tiles will be black
Read more about sequence and patterns at: