You are given $B,G,H,J$ bases for a real linear space $X$ and the change of basis transition matrices. What is the dimension of $X$?

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I'm not sure how I should go about this question, so I can't really give any other information. All I know is that dimension is the number of vectors in the basis set $X$.

I would really appreciate your help. Thank you

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Remember, the $i$th column in a basis transformation matrix is the $i$th basis element coordinated in the other basis.
Since the matrices have $3$ columns, there were $3$ elements in any of the given bases.