The angles of a quadrilateral are 3x degree, 2x+10 degree, x-15 degree and 40-x degree. Find the value of x
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By angle sum property
The sum of angles of quadrilateral = 360°
3x + 2x + 10 + x - 15 + 40 - x = 360
3x + 2x + x - x + 10 + 40 -15 = 360
5x + 35 = 360
5x = 360 - 35
5x = 325
x= 325/5
x = 25
3x = 3 * 25
= 75
2x + 10 = 2 * 25 + 10
= 60
x - 15 = 25 - 15
= 10
40 - x = 40 - 25
15
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