Geometry
posted by David .
Ray SP bisects angle RST.
m<RSP if m<RST = 5/2y degrees and m<PST = (y+5)
M< = The measure of angle

Given: RST = 5Y/2; PST = Y+5.
RST = 2PST,
5Y/2 = 2(y+5),
Multiply both sides by 2:
5y = 4(y+5).
5y = 4y + 20,
5y  4y = 20,
Y = 20 Deg.
y + 5 = 20 + 5 = 25 Deg = PST = RSP.
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