Charla wants to cover a rectangular area of her driveway with a picture using chalk. If she completes 2/3 of
the area in 1/2 hour, how long will it take her to complete the entire picture? (1 point)
If Charla completes 2/3 of the area in 1/2 hour, then she completes 1/3 of the area in 1/2 hour since 2/3 - 1/3 = 1/3.
Therefore, in 1 hour (which is 2 times by 1/2 hour), Charla can complete 2*(1/3) = 2/3 of the area.
Since she wants to complete the entire area, it will take her 1 hour to finish the entire picture. Answer: \boxed{1}.