A5. Bronze is an alloy of copper and tin in the ratio 47 : 3. How much tin is in a bronze monument weighing $350 \mathrm{~kg}$?
(A) $7 \mathrm{~kg}$
(B) $21 \mathrm{~kg}$
(C) $300 \mathrm{~kg}$
(D) $329 \mathrm{~kg}$
(E) none of the above
A5. Due to the ratio of $47: 3$, in $50 \mathrm{~kg}$ of bronze there is $3 \mathrm{~kg}$ of tin, and in $350 \mathrm{~kg}$ of bronze there is $21 \mathrm{~kg}$ of tin.