Answer:
15 feet 1 inch
Step-by-step explanation:
Given :
Length of boards placed end to end :
Board 1 = 4 feet 5 inches
Board 2 = 6 feets 9 inches
Board 3 = 3 feets 11 inches
The length is the addition of the lengths of the 3 boards :
4 ft 5in + 6 ft 9 in + 3 ft 11 in
(4+6+3) ft + (5+9+11) in
13ft + (25in)
1 ft = 12 in
25 in = 2 ft 1 in
13 ft + 2ft 1 in
15 ft 1 in
