Element $$X$$ with atomic mass $$10$$ was allowed to react completely with element $$Y$$ of atomic mass $$20$$ to form a compound. When this compound was analysed it was found that it contains $$60\%$$ of $$X$$ and $$40\%$$ of $$Y$$ by weight. The simplest formula of this compound will be

A

$$X_3Y$$

B

$$X_2Y_3$$

C

$$Y_3X$$

D

$$X_6Y_4$$