Two elements \( \mathrm{A} \) and \( \mathrm{B} \) which form \( 0.15 \) moles of \( \mathrm{A_2B} \) and \( \mathrm{AB_3} \) type compounds. If both \( \mathrm{A_2B} \) and \( \mathrm{AB_3} \) weigh equally, then the atomic weight of \( \mathrm{A} \) is ______ times of atomic weight of \( \mathrm{B} \).
