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3x =180
x=60 (answer)
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Let the number be x
so let the other angle be y = 90 - x
according to question x = 2(90 - x)
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
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