Question: how to calculate the difference between two ratios?
Answer: For example, if the ratios are 3:5 and 9:15, multiply 3 by 15 and 5 by 15 to get 45:75. Multiply both numbers in the second ratio by the original second number of the first ratio. In this example, multiply 9 by 5 and 15 by 5 to get 45:75. Compare the results.