  In the three-state mixing framework, considering the possible glueball
components of $\eta$ and $\eta^\prime$, we investigate the hadronic decays of
$f_0(1370)$, $f_0(1500)$ and $f_0(1710)$ into two pseudoscalar mesons. The
quarkonia-glueball content of the three states is determined from the fit to
the new data presented by the WA102 Collaboration. We find that these data are
insensitive to the possible glueball components of $\eta$ and $\eta^\prime$.
Furthermore, we discuss some properties of the mass matrix describing the
mixing of the isoscalar scalar mesons.
