To find out how many square feet the painter can paint in 7 hours at the given rate, we need to find the painter's rate per hour and then multiply it by 7.
The painter can paint 375 square feet in 3 hours, so his rate is 375/3 = 125 square feet per hour.
Therefore, the painter can paint 125 * 7 = <<125*7=875>>875 square feet in 7 hours. Answer: \boxed{875}.
A painter can paint 375 square feet in 3 hours a this rate how many square deet can he pant in 7 hours
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