  Garth Dales asked whether a Banach algebra $\mA$ with an Arens regular closed
ideal $\mJ$ and an Arens regular quotient $\mA/\mJ$ is necessarily Arens
regular. We prove in this note that, for a class of Banach algebras including
the standard algebras in harmonic analysis, Garth's conditions force the
algebra to be even reflexive. We also give examples of Banach algebras with
Garth's conditions, that are not Arens regular.
