algebraic division question

[fran1942]

Hello, I can't understand where the '2' came from in this equation.

5x^2y / 10xy^3
=
x/2y^2

I can see how the other values were calculated but the '2' before the y^2 is puzzling me.
Thanks for any clarification.

[ArcanaNoir]

5/10=1/2

[bubokribuck]

5x^2y and 10xy^3 both have a common factor 5xy. Try factorising now.