start by comparing the numbers as decimals
[tex]\begin{gathered} \frac{2}{3}\approx0.666666667 \\ \frac{7}{9}\approx0.777777778 \end{gathered}[/tex]
to complete the inequality we must find a number in between
[tex]\begin{gathered} \frac{3}{5}\approx0.6 \\ \frac{6}{9}\approx0.6666666667 \\ \frac{3}{4}=0.75 \\ \frac{6}{7}=0.857143 \end{gathered}[/tex]
the only number that is between this 2 is 3/4 or 0.75
