Find the angle which is $20^{o}$ more than its supplement.

90

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95

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100

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105

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Solution

The correct option is C $100$
Let the required angle be $x$ , then its supplement $= (180 - x)$
Given that $x = (180 - x) + 20$
$\Rightarrow 2 x = 200 \Rightarrow x = 100^{o}$

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