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180-76=104
104:4= 26
A= 26
3a =78
B) 180- (83+ 10) = 87
87:3=29
A= 29
2a+10=68
C) 360 -(80+10) = 270
270:4 = 67,5
A= 67,5
2a=135
A+10= 77,5
D) 135-30= 105
360-105= 255
255:3=85
A= 85
A-30 = 85-30= 55
E)115 x 2 = 230
360 - 230= 130
130:2=65