Answer:
Here,
( 15x + 1 ) + ( 6x + 5 ) + ( 4x - 1 ) = 180
or, 15x + 1 + 6x + 5 + 4x - 1 = 180
or, 25x + 5 = 180
or, 25x = 180 -5
or, x = 7
Lastly,
C = (4x - 1 )
= 4 * 7 - 1
= 27 degree
Hope it helped
Hope it helped ALL THE BEST !!
