Answer :

How many yards of a carpeting that is 26 inches wide will be needed to cover a floor that
is 12ft by 13ft?

12ft = 144in
13ft = 156in

144in 
× 156in= 22464in²
(12ft) 
× (13ft) = (156ft²)

22464in² ÷ 26in = 864in needed