Answer :
It is given that Henry has 52/9 ounces of chocolate.
Each gravestone requires 2/9 ounce of chocolate.
Hence the number of gravestones possible are:
[tex]\begin{gathered} \frac{\frac{52}{9}}{\frac{2}{9}}=\frac{52}{9}\times\frac{9}{2} \\ =\frac{52}{2} \\ =26 \end{gathered}[/tex]Hence 26 gravestones are possible.