Answer:
7 cans
Step-by-step explanation:
The number of cans of paint is presumed to be proportional to the area, so ...
(4 cans)/(480 ft²) = (how many cans)/(840 ft²)
Multiplying by 840 ft², we get ...
(how many cans) = (4 cans)(840 ft²)/(480 ft²) = (4 cans)(7/4)
(how many cans) = 7 cans
