Answer:
[tex]\sf b) \quad \dfrac{y^3}{4x}[/tex]
Explanation:
[tex]\sf \left(\dfrac{6x^2}{5y}\right) \left(?}\right) = \left(\dfrac{3xy^2}{10}\right)[/tex]
cross multiply variables
[tex]\sf ? = \left(\dfrac{3xy^2 (5y)}{10(6x^2)}\right)[/tex]
distribute inside parenthesis
[tex]\sf ? = \left(\dfrac{15xy^3}{60x^2}\right)[/tex]
remove parenthesis and simplify
[tex]\sf ? = \dfrac{y^3}{4x}[/tex]
