... x represent the number of ounces of oil to be added. There- fore, the total number of ounces of vinegar in the new mixture will be (0.40)(12), and the total number of ounces of new mixture ... each of these statements, the base of the percent is in the denominator. 12 1.7 Ratio The ratio of the number 9 to the number 21 can be expressed in several ways; for example, 9 to ... percent. Another way to view this problem is to simply divide 5 by the base, 80, and then multiply the result by 100 to get the percent. If a quantity increases from 600 to 750, then the percent...