6 paint cans are needed.
Given to us,
Total Area = 2,200 units²,
Area one can of paint covers = 400 units²,
Cans of paint are needed to cover total area = \(\rm{\dfrac{Total\ Area }{Area\ one\ can\ of\ paint\ covers}}\)
Cans of paint are needed to cover total area = \(\dfrac{2,200}{400}\) = 5.5 cans
So, 5.5 cans of paint are needed to cover total area 2,200 units², but we know it is not possible to get half paint can. therefore, A total of 6 paint cans are needed to cover an area of 2,200 units².
Hence, 6 paint cans are needed.
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