Question 1184332
A = 1.4 mg.
A = 2 * abs(B - C)
A = C + .8


from A = C + .8, you get:
1.4 = C + .8
subtract .8 from both sides of that equation to get:
1.4 - .8 = C
solve for C to get:
C = .6


from A = 2 * (B - C),  you get:
1.4 = 2 * (B - .6)
simplify to get:
1.4 = 2 * B - 1.2
add 1.2 to both sides of the equation to get:
1.4 + 1.2 = 2 * B
combine like terms to get:
2.6 = 2 * B
solve for B to get:
B = 1.3


your solution should be A + B + C = 1.4 + 1.3 + .6 = 3.3 mg.


to confirm the numbers are good:


A = 1.4, B = 1.3, C = .6
A = 2 * (B - C) becomes:
A = 2 * (1.3 - .6) which becomes:
A = 2 * (.7) which becomes:
A = 1.4 which is true.


A = 1.4, C = .6
A = C + .8 becomes:
A = .6 + .8 which becomes:
A = 1.4 which is true.


all original statements are true when A = 1.4 and B = 1.3 and C = .6
this confirms the numbers are correct.
the solution is the sum of those numbers = 3.3.