3 yd. 15 in. plus 1 yd. 3 ft. 6 in?

To add the measurements, first convert everything to inches. 3 yards 15 inches is equal to (3 \times 36 + 15 = 108 + 15 = 123) inches. 1 yard 3 feet 6 inches converts to (1 \times 36 + 3 \times 12 + 6 = 36 + 36 + 6 = 78) inches. Adding these together gives (123 + 78 = 201) inches. Finally, converting back to yards, feet, and inches, (201) inches is (5) yards (6) inches.