GMAT PREP

[hrn423]

I am new (test on Saturday and stressing)

Please see attached. Explanation is appreciated[/img]

[jayhawk2001]

1- sufficient.
Exterior angle PRS = sum of interior opposite angles
= angle RPQ + angle PQR
= PRS - PQR = RPQ.
We know the difference and hence is sufficient.

2 - sufficient.
PQR + PRQ = 150
We know PRQ = 180 - angle-PRS
PQR + 180 - PRS = 150
We can hence find PRS - PQR

Hence D

[moneyman]

Excellent approach Jayhawk..