If EPDM roofing is installed at 35 squares per day, how many squares are installed in 4 days?

• A. 105 squares
• B. 120 squares
• C. 140 squares
• D. 160 squares

Answer: (C)

Total work equals the daily rate times the number of days. At 35 squares per day for four days, multiply 35 by 4. That gives 140, since 30×4 = 120 and 5×4 = 20, and 120 + 20 = 140. So 140 squares are installed. (For context, one roofing square is 100 sq ft, so this would be 14,000 sq ft in total.)