Without additional context, the exact percentage of meat to fat in ground beef cannot be determined from the options presented (90/10, 80/20, 75/25, or 50/50). Each ratio represents a different mix of meat to fat.
The percentage of meat to fat in ground beef is typically represented by ratios such as 90/10, 80/20, 75/25, or 50/50. These ratios indicate the proportion of meat to fat in the mix, with the first number representing the percentage of meat and the second number indicating the percentage of fat. Therefore, an 80/20 ground beef mix means that the product consists of 80% meat and 20% fat. The student's question does not provide enough information to determine the exact percentage without additional context or clarification.