From the known situation:

Gold:12 * (1-19/32) = 4.875.

Silver:12 * (1-54/67) = 2.32358.

Huang Guan:12 * (1-85/128) = 4.03125.

Then:

4.875/ 12 *( 12-Y)+2.328358/ 12 * Y = 4.03 125

4.875 *( 12-Y)+2.328358Y = 4.03 125 * 12

58.5-2.546642Y=48.375

Silver: Y=3.975824

Gold:12-3.95824 = 8.045438+076.