Data Sufficiency

May someone help. I cannot see heads or tails on this one.

Stem rephrase: You want to know PRS-PQR=?

Answer will either be D or E since both statements give us the same information

1) Tells us QPR = 30 - SUFFICIENT
2) Tells us QPR = 30 (PQR + PRQ = 150, so 180-PQR+PRQ = 30) -SUFFICIENT

How? Set up two equations:

RPS+30+PQR=90
RPS+PRS=90, or RPS=90-PRS

90-PRS+30+PQR=90
Solve: PRS-PQR=30

Answer D

Thanks so much