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# An angle is double its supplementary angle. What is the value of this angle?

$( A ) 120^{\circ} \\ ( B ) 135^{\circ} \\ ( C ) 125^{\circ} \\ ( D ) 130^{\circ}$

If $x$ is supplementary angle, the angle is double, hence $2x$. But $x + 2x = 180$
Hence $3x = 180$
$x = \frac{180}{3} = 60$. Hence the angle ( $2x$ ) is $2*60 = 120$