そんなものだよ。
It's normal.
That's just what I was going to say.
そういうわけさ
What of that?
そういうことです。
そういうわけか
まあそんなものさ
I'll tell you [This is] what happened [how it happened].
something similar to something previously specified
こういうわけさ
(理由を述べるのなら)―This is how it is―(物語を叙するのなら)―This is how it happened.
Roughly speaking, that is the state of the case.
まあそんなわけさ
It is something like this one.
This is how it stands.
こういうわけであるさま
そういうことでは