The Smith family has an inground pool that is shaped like a rectangle. The pool measures 15 feet by 8 feet and is surrounded with the patio
that measures 18 feet by 13 feet. How much of the patio will not be
covered by the pool?

distance covered by pamela in 9 l of fuel = 99km

let us apply unitary method here.

distance covered by pamela in 1 l of fuel =99/9 =11 km

now let us find distance covered by pamela if she has 12 l of fuel.

distance covered in 12 l = distance covered in 1 l of fuel * 12

we know that distance covered by here in 1 l is 11 km.

so distance covered in 12 l of fuel = 11*12 = 132 km.

you could deduce the conclusion directly using the facts pertaining to the specific situation.

hope this .