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180 = 15x - 60
240 = 15x
x = 16
A = ( 4x + 10 )° = ( 4 × 16 + 10 )° = 74°
B = ( 5x - 30 )° = ( 5 × 16 - 30 )° = 50°
C = ( 6x - 40 )° = ( 6 × 16 - 40 )° = 56°