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a-miara 1. kąta
b-miara 2. kąta
c--miara 3. kąta
a+b+c=180°
a+15°=b
b+30°=c
180°=a+a+15°+(a+15°)+30°
180°=3a+60°
120°=3a
a=40°
b=40°+15°
b=55°
c=55°+30°
c=85°
Odp.: miary kątów wynoszą 40°, 55° i 85°.