Rachel looked at the two ratios 25:30 and 250 : 300. In each ratio she noticed that the first and second numbers have a common actor. What are some common factors of 25 and 30? What are some common factors of 250 and 300?. Rachel says that the two numbers in a ratio will always have a common factor. Is she correct? Abby looked at the same ratios (25 :30 and 250:300). In these two equivalent ratios, she noticed that the first numbers have a common factor and the second numbers have a different common factor. What are some common factors of 25 and 250? What are some common factors of 30 and 300? Abby says that the first numbers in two equivalent ratios will always have a common factor. Is she correct?