  The LHCb collaboration has recently measured the first direct CP violation in
$B^0_s$ decays with a rate asymmetry $A_{CP}(B^0_s\to K^- \pi^+)$ given by
$0.27 \pm 0.04(stat)\pm 0.01(syst)$. At the same time they also made the most
precise measurement for $A_{CP}(B^0 \to K^+ \pi^-) = -0.080\pm 0.007(stat)\pm
0.003(syst)$. These data confirm the predicted relation, $A_{CP}(B^0 \to K^+
\pi^-)/A_{CP}(B^0_s \to K^- \pi^+) = - Br(B^0_s\to K^- \pi^+)\tau_{B^0}/Br(B^0
\to K^+ \pi^-)\tau_{B^0_s}$, in the standard model with SU(3) flavor symmetry.
We discuss possible modifications due to SU(3) breaking effects to this
relation. There are several other similar relations in B decays. Using current
available data we study whether relevant relations hold in $B^0$ and $B^0_s$ to
$PP$ and $PV$ decays. Here $P$ and $V$ indicate pesudoscalar and vector mesons
in the flavor octet representations.
