Question 19
A goldsmith has two alloys. The first alloy contains $90\%$ gold and the second $54\%$ gold. The goldsmith mixed $320~\mathrm{g}$ of the first alloy and $160~\mathrm{g}$ of the second alloy to obtain a new alloy. What percentage of gold does the new alloy contain?
(A) 33
(B) 48
(C) 65
(D) 72
(E) 78
(A) 33
(B) 48
(C) 65
(D) 72
(E) 78