Question 653154
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
an angle{{{highlight(x)}}} is four fifth of its complement{{{highlight(90- x)}}}
Question states***
 {{{ x = (4/5)(90-x)}}}
  {{{x = 72 - (4/5)x}}}
  {{{(9/5)x = 72}}}
    {{{ x = 72(5/9)}}}
           x = 40°

and...(it's complement is 50°)
 {{{40 = (4/5)(50) = 40}}}