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
Verified Correct Answer: B.
Step-by-Step Mathematical Solution
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
Source: Myschool Past Questions Archive (Record #26591)