A percent problem is one in which you are given a quantity and asked to compute the value of a percent of it. You may also be given the whole quantity and a part of it and asked to compute the percentage of the part in the whole. To do these kind of problems you need to use the rule which states that the ratio of the part to the base it equal to the ratio of the percent to hundred. That is part/base = percent/100. This comes from the definition of percentage which states that percentage is equal to the ratio of part of a quantity to the whole quantify multiplied by 100. Now when you are given with one of the two values and asked to computer the third value, substitute them in the above equation. This video shows how to solve percent and proportion problems in mathematics.