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:
<h3>Formation of the tiles</h3>
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:
brainly.com/question/15590116
9-2/5-1 and you just divide it and should get the answer.
11, 13, 15
...............
Divide 141 by 2, getting 70.5. Since 70.5 is halfway between two consecutive integers, 70 and 71, these are the locker numbers. (P.S. This method only works with odd numbers.) 70+71=141.
Given a integer depending on whether or not it is positive or negative it is always opposite of what it is. For example the opposite of 7 is -7