Question

The angle which is 2 times its complement

Answer 1

x=2*(90-x)
  =180-2x
3x =180
x=60 (answer)

Answer 2

let the number be x
so let the other angle be y = 90 - x
according to question x = 2(90 - x)
so
x = 2(90-x)
 ⇒x =180 - 2x
⇒3x =180
⇒x = 60 
so its complement is 30 s0 we fond 60 is 2 times its complement