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Question

An angle is 45o less than two times of its supplement, then the greater angle is ___________.

A
75o
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B
100o
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C
120o
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D
105o
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Solution

The correct option is D 105o
Let X and Y be two supplementary angles.
We know X+Y=180 ............(1)
Let Y be greater angle.
Y=2X45 as per the question ...........(2)
From (1) and (2), we have
X+2X45=180
3X=225
X=75
Thus Y=18075=105 ....It is the largest angle.

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