t are the steps to solve

5 ft 9 in + 7 ft 8 in + 3ft 6 in =?

Add like terms (add ft to ft add inches to inches)

(5ft + 7 ft + 3 ft) +(9 in +8 in + 6 in)

15ft + 23 in

If the inches was less than 12 we would be done but Since 23 in is greater than 12 inches, we can simplify it more

23 in=?

23 in * 1 foot/12 in = we see that we get 1 foot remainder 11 inches : 1ft + 11in

We can also realize this if we subtracted 12 from 23 in, and saw that there is 11 in left

Now we rewrite our original eqn replacing the 23 in with 1ft + 11 in

15ft + 23 in => 15 ft + 1 ft + 11 in => 16ft + 11 in

We can write this as:

16ft 11in

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