The angles of quadrilateral are $4 x, x + 20, 3 x + 30, 2 x + 10$ Find x

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Solution

Angles are $4 x,, x + 20, 3 x + 30, 2 x + 10$
Sum of angles is $360$
$4 x + x + 20 + 3 x + 30 + 2 x + 10 = 360 10 x + 60 = 360 10 x = 300 x = \frac{300}{10} = 30$

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