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