Angles of a triangle

In the triangle ABC, the angle beta is 15° greater than the angle alpha. The remaining angle is 30° greater than the sum of the angles alpha and beta. Calculate the angles of a triangle.

Correct result:

a =  30
b =  45
c =  105

Solution:

b=15+a
c = 30+a+b
a+b+c = 180

a-b = -15
a+b-c = -30
a+b+c = 180

a = 30
b = 45
c = 105

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