Question

Given that, a+b=23,b+c=35 and a+c=20, what is the average of a,b and c

Answer 1

Answer:

a+b=23 b+c=35 a+c=20

a=23-b c=35-b (23-b)+(35-b)=20

a=23-19 c=35-19 23-b+35-b=20

a=4 c=16 58-2b=20

58-20=2b

38=2b

b=38/2

b=19