If ∠P + ∠Q = 240 and ∠R = 90, find the remaining angle of the quadrilateral PQRS.

If ∠P + ∠Q = 240 and ∠R = 90, find the remaining angle of the q

1.	If ∠P + ∠Q = 240 and ∠R = 90, find the remaining angle of the quadrilateral PQRS.
A.	30°
B.	40°
C.	50°
D.	60°
Answer» B. 40°