If the angles of quadrilateral are (p + 10)°, (2p – 30)°, (3p + 20)° and 4p°, find p.

A.
63 
B.
40 
C.
36 
D.
28
Correct Answer: Option C
Explanation
The sum of angles in a quadrilateral = 360°
(therefore (p + 10) + (2p – 30) + (3p + 20) + 4p = 360)
(10p = 360° implies p = frac{360}{10} = 36°)