How to determine the whole number when given the part and percent

The video tutorial explains how to solve percentage problems using proportions. It begins with an introduction to the concept of percentages and proportions, followed by setting up a proportion to solve a specific problem: finding what number 18 is 40% of. The tutorial then demonstrates solving the proportion by dividing and using long division to find the unknown value, which is 45. The explanation includes detailed steps and encourages understanding of the process for future problems.

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