Answer:
[tex]1 \dfrac{7}{12} \ \textsf{cups}[/tex]
Step-by-step explanation:
Banana bread recipe:
Dry ingredients = flour + sugar
             [tex]=2 \dfrac13+\dfrac34=\dfrac73+\dfrac34=\dfrac{37}{12} \ \textsf{cups}[/tex]
Difference = dry ingredients - bananas
         [tex]=\dfrac{37}{12}-1 \dfrac12\\\\=\dfrac{37}{12}-\dfrac32\\\\=\dfrac{37}{12}-\dfrac{18}{12}\\\\=\dfrac{19}{12}\\\\=1\dfrac{7}{12} \ \textsf{cups}[/tex]