Question

three boards are placed end to end to make a walkway. the first board is 3 feet 9 inches long, the second board is 5 feet 7 inches long, and the third board is 3 feet 4 inches long. how long is the walkway?
write your answer in feet and inches. use a number less than 12 for inches.
ft in

Explanation:

Step1: Sum the feet values

$3 + 5 + 3 = 11$ ft

Step2: Sum the inch values

$9 + 7 + 4 = 20$ in

Step3: Convert excess inches to feet

Since $12$ in $= 1$ ft, $\frac{20}{12} = 1$ ft with a remainder of $8$ in

Step4: Add converted feet to total feet

$11 + 1 = 12$ ft

Answer:

12 ft 8 in