3 feet 6 inches + 8 feet 2 inches + 4 inches + 2 feet 5 inches ------------------------ 13 feet 17 inches [add inches separately from adding feet] Now, 12 inches = 1 foot, so convert 17 inches to 1 foot 5 inches: 13 feet + 1 foot 5 inches ----------------------------- 14 feet 5 inches
I think this is the answer