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dashofnoa

Answer: y=12/5 and P=120

Step-by-step explanation:

Set (10y-4)=(5y+8) which makes y=12/5

Substitute y in for both PS and QR to get 20 and 20

If PQ=2PS, then 2(20)=40. Do the same for SR to also get 40

40+40+20+20=120