Question

A rectangular length times its width is 18 square inches what are the possible whole number length and width of the rectangle

Answer 1

It's easy.
the area of the rectangle is 18 sq inches.
It generally means the length and width of the rectangle should be the multiples of 18.

There are 3 possible answers.

lenght=18/width=1 or length=1/width=18
lenght=2/width=9 or length=9/width=2
lenght=6/width=3 or length=3/width=6