the answer is a
A.
A=0 b=0 c=0
b + b + b + c + c + c + c = 3b + 4c
2a. (a, b and c are all equal.)
a= (+a) or a= (-) b= 2a b= 2a c= (-a) c= (+a)
the answer is a
Because there is no way to define the divisors, the equations cannot be evaluated.
A.
a=24 b=16 c=18
A=0 b=0 c=0
b + b + b + c + c + c + c = 3b + 4c
a = 20 b = 60 c = 100
2a. (a, b and c are all equal.)
A+c= 2a+b
7.5
x + y + z = 0 x = a - b, y = b - c, z = c - a, therefore a - b + b - c + c - a = ? a - a + b - b + c - c = 0