Which of the following has the maximum number of atoms?

Two elements, R and S, combine to form $RS_2$ and $R_2S_3$. If 10 g of $RS_2$ contains 0.1 mole and 9 g of $R_2S_3$ contains 0.05 mole, find the atomic weights of R and S.

Elements A and B form two compounds $A_2B$ and $A_3B_2$. 0.2 moles of $A_2B$ weighs 20 g, and 0.1 moles of $A_3B_2$ weighs 18 g. Find the atomic weights of A and B.

Two elements P and Q react to form compounds with formulas $PQ_2$ and $P_2Q$. If 0.1 mole of $PQ_2$ weighs 5 g and 0.2 mole of $P_2Q$ weighs 14 g, what are the atomic masses of P and Q?

Elements X and Y form compounds $XY_2$ and $X_3Y_2$. If 20 g of $XY_2$ contains 0.2 moles and 18 g of $X_3Y_2$ contains 0.1 moles. What are the atomic weights of elements X and Y?

Elements M and N form two compounds, $MN$ and $M_2N_3$. 0.5 moles of $MN$ weighs 25 g, and 0.1 moles of $M_2N_3$ weighs 13 g. Determine the atomic weights of M and N.