Answer :
The fraction for mashed banana is 7/8.
The fraction of cup for mashed strawberries is 5/6.
Multiply the fraction 7/8 by 3/3 to obtain the same deniminator.
[tex]\frac{7}{8}\cdot\frac{3}{3}=\frac{21}{24}[/tex]Multiply the fraction 5/6 by 4/4 to obtain the same denominator as fraction 21/24.
[tex]\frac{5}{6}\cdot\frac{4}{4}=\frac{20}{24}[/tex]So Sam can write 7/8 as 21/24 and 5/6 as 20/24.