I need 220 meters of tiles in a box of 9 pieces 20×20 How many boxes do I need?

The length of the tiles in one box will be 9 * 20 = 180, because both sides of the tiles are equal, and it makes no sense to consider two cases if the tile had different sides.
One box of 180 meters of tiles, but this is not enough for us.
Let’s find the number of boxes that we need. To do this, think:
If we divide the length that we need (220 m) by the length of the tiles in the box (180 m), then the integer part of this number is the number of boxes whose tiles can fit into our given length (220 m). But we then need to completely lay out all the tiles, so we have to buy another box, and it turns out we will have a surplus, as it should be.
220/180 = 1.22222 …, integer part 1
And plus one more box = 2
Answer: 2 boxes