If the interior angles of a triangle are (x + 30)°, (x - 10)°, and (2x - 20)°, find the value of x.

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Solution

The correct option is B 45
Given: Interior angles of a triangle are (x + 30)°, (x - 10)°, and (2x - 20)°.

We know that sum of interior angles of a triangle is 180°.

So, (x + 30)° + (x - 10)° + (2x - 20)° = 180°
4x = 180
x = 45

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