Question 933849
Complementary angles sum to be 90 degrees.

let A be the first angle and B be the complementary angle.
Since the angles are complementary, you know {{{A + B = 90}}}
You are told {{{B = 2*A}}}
Substituting for B in the first equation yields
{{{A + (2A) = 90}}}
{{{3A = 90}}}
{{{A = 30}}}
So B = 2*30 = 60