So,
Here we have the expression:
[tex]\frac{\frac{4}{5}}{\frac{A}{10}}=\frac{10}{5}\cdot\frac{2}{B}[/tex]To find the set, first we should operate each fraction:
[tex]\frac{40}{5A}=\frac{20}{5B}[/tex]Now we could multiply by cross:
[tex]200B=100A[/tex]And if we solve for B, we obtain the set:
[tex]B=\frac{1}{2}A[/tex]Therefore, the set of values for A and B that make the equation true, satisfies that:
[tex]B=\frac{1}{2}A[/tex]This set could be: A=10 and B=5