Your question lacks the mention of orientation of the blocks and hence the discrepancy in the question.
If the blocks are horizontal then,

F. = 3a

T = F - 2a

T= 1a

Therefore, T= F/3.
If the blocks are aligned vertically with the 1 kg block on top attached to a string, then
F= T - 2g
T= T1 - 1g

Therefore, T= F+2g
T1= F+3g.
Hope that helps.