How many cans of paint needed to cover area of 2200 square units if one can paint covers area of 400 square units?

To determine the number of cans of paint needed to cover an area of 2200 square units, divide the total area by the coverage of one can. This is calculated as 2200 square units divided by 400 square units per can, which equals 5.5. Since you cannot purchase half a can, you will need to round up to the nearest whole number, requiring 6 cans of paint.