The measure of an angle whose supplement is three times

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The measure of an angle whose supplement is three times as large as its complement, is

Let the required angle be y°.
According to the question,
180 – y = 3(90 – y )
⇒ 180 – y = 270 – 3y
⇒ 3y – y = 270 – 180

⇒ 2y = 90 ⇒ y =	90	= 45°
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