Here is the work in order:

Configuration after third move: A=160, B=160, C=160
A+C = 320 and A + 1/6C = 160 and solve for "A" we get 128.
C = 320-128 = 192

Configuration after second move: A=128, B=160, C=192
B+C = 352 and C + 1/5B = 192 and solve for "B" we get 200.
C = 352 - 200 = 152

Configuration after first move: A=128, B=200, C=152
A+B = 328 and 1/3A + B = 200 and solve for "B" we get 136.
A = 328 - 136 = 192

At the beginning we have: A=192, B=136, C=152

Thanks!