A, B and C are three angels of a triangle. If angle A - B =15 degrees, angle B - C= 30 degrees

A-B=15

So,

B=A-15..(i)

B-C=30

So

C=B-30=(A-15)-30=A-45..(ii)

A+B+C=180(A.S.P.)

So,

A+(A-15)+(A-45)=180

Solving, we get,

3A=240

A=80

B=A-15=65

C=A-45=35

So,

A=80,B=65,C=35