How many blue counters must be added so that the ratio of yellow counters to total counters is 16?

To determine how many blue counters must be added so that the ratio of yellow counters to total counters is 16, you need to set up the equation based on the current number of yellow counters (Y) and the current number of blue counters (B). Let X be the number of blue counters added. The equation would be ( \frac{Y}{Y + B + X} = \frac{16}{1} ). You can solve for X to find the number of blue counters needed.