If a = 80 ° and B = C, then C = ()

If a = 80 ° and B = C, then C = ()

The sum of the inner angles of a 50 ° triangle is 180 ° i.e. ∠ a + B + C = 180 ° C = (180 ° - a) / 2 = 50 °

A + B = 88 B + C = 80 C + a = 98 find a =? B =? C =?

a+b=88 b+c=80 c+a=98
a+b+b+c+c+a=88+80+98=266=2a+2b+2c
a+b+c=133
a+b+c-(a+b)=133-88=45=c
b=35
a=53

A + B = 88 B + C = 80 C + a = 98 find a =? B =? C =?

b=80-c
a=98-c
(80-c)+98-c=88
178-2c=88
c=45
a=53
b=33

In a subtraction formula A-B = C, it is known that the sum of three numbers ABC is 150 and C is four times of B. what are the three numbers ABC

B:150÷【（4+1）+（4+1）】=15
C:15X4=60
A:15+60=75