Verified Answer :

We get 15 feet and 20 inches and since 12 inches = 1 foot

16 feet 8 inches

Firstly convert inches to feet
12inches=1foot
9inches=X
1×9=12×X
9=12X
X=9/12
=0.75 foot

12i=1f
11i=x
11=12x
X=11/12
=0.916666666667

5+0.75
=5.75

10+0.916666666667
=10.9166666667

5.75+10.91666666667
=16.6recurring