Question

Find the value of X ​

Answer 1

$x + 3x + 80 = 180 \\ 4x = 180 - 8 0 \\ 4x = 100 \\ x = \frac{100}{4} \\ x = 25 \: \: \:$

Answer 2

The sum of all the angles of the triangle is 180°.

80 + 3x + x = 180°

80 + 4x = 180°

4x = 180 - 80

4x = 100

x = 100/ 4

x= 25