Does a pound of gold or a pound of feathers weight more?

remember: precious metals are measured in troy weight, in which one pound equals 12 ounces.

I believe the answer would be 443. I came up with my own way of solving it without going through the long process. Since the pattern is 14 gets added onto each number, I decided to multiply 14 x 47 = 658. Then I added 658 + (-215) and got 443. This is NOT how it should be done, but I if I am wrong, let me know and I'll redo the calculation(s).