what is the sum of 5ft 9in + 12ft 3in
The sum is 18ft because 9in + 3in is 12in which is a foot. Then 12+1+5= 18ft
We already know that 1 ft= 12 in.5 ft 9 in= 5 ft (12 in/1 ft)+ 9 in= 69 in12 ft 3 in= 12 ft (12 in/1 ft)+ 3 in= 147 in5 ft 9 in+ 12 ft 3 in= 69 in+ 147 in= 216 inThe final answer is 216 in.Hope this would help~