To find formula of compound composed of A and B which is given by ${\mathrm{A}}_{\mathrm{x}}{\mathrm{B}}_{\mathrm{y}}$, it is strongly heated in oxygen as per reaction :

${\mathrm{A}}_{\mathrm{x}}{\mathrm{B}}_{\mathrm{y}}+{\mathrm{O}}_2\to \mathrm{AO}+$Oxide of B

If 2.5 g of ${\mathrm{A}}_{\mathrm{x}}{\mathrm{B}}_{\mathrm{y}}$ on oxidation gives 3 gm oxide of A, Find empirical formula of ${\mathrm{A}}_{\mathrm{x}}{\mathrm{B}}_{\mathrm{y}}$,
[Take atomic mass of A=24 and B=14 ]