What value of x will make this proportion true 3/29 =× /116?

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Louis wants to carpet the rectangular floor of his basement the basement has an area of 864 square feet the width of the basement is 2/3 its length what is the length of lewis's basement

What is the surface area of a cube with the volume of 729 ft?