How complex fractions can be used to solve problems involving ratios

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 it's length. what is the length of louis's basement

Which inequality is equivalent to -3x < -12? x < 4 , x < -4 , x > 4, x > -4

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'