Add 4 yards 2 feet 8 inches, 3 feet 11 inches and 6 yards 6 feet and 6 inches

Yards: 4+6

Feet: 2+3+6

Inches: 8+11+6

So the total is 10 yards, 11 feet, and 25 inches. There are 12 inches in a foot so 25 inches is actually 2 feet and 1 inch. So now there are 13 feet in total.

There are 3 feet in every yard, so 13 feet can be rewritten as 4 yards and 1 foot. So in total there are 10+4 yards, 1 foot, and 1 inch.

Answer: 14 yards, 1 foot, and 1 inch.