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The four interior angles of a quadrilateral are (x + 20) o, (x+ 10) o…

The four interior angles of a quadrilateral are (x + 20) o, (x+ 10) o (2x – 45) o and (x – 25) o. Find the value of x
  • A.
    60
  • B.
    80
  • C.
    100
  • D.
    360
Correct Answer: Option B
Explanation

Sum of interior angles in a quadrilateral is 360
(x + 20)o + (x+ 10)o + (2x – 45)o + (x – 25)o = 360o
5xo – 40o = 360o
x = 400/5 = 80o

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