Understanding Percent Problems

This video tutorial explains how to solve percent problems using a specific formula: 'is over of is equal to percent over 100'. The instructor demonstrates the cross-multiplying method to solve these problems, providing a detailed example where 80% of an unknown number equals 12. By setting up the equation and solving for the unknown, the instructor shows that the number is 15. The video concludes with a summary of the method and encourages viewers to use this approach for similar problems.

What is the main topic discussed in the video?

• Studying geometry

• Learning about fractions

• Understanding percent problems

• Solving algebraic equations

Which formula is used to solve percent problems?

• distance equals rate times time

• a squared plus b squared equals c squared

• area equals length times width

• is over of equals percent over 100

What method is used to solve the proportion in the formula?

• Elimination method

• Graphing method

• Cross multiplication

• Substitution method

What is the first step in setting up the proportion for the example problem?

• Divide 80 by 100

• Set 12 over the unknown

• Multiply 12 by 80

• Subtract 12 from 80

In the example, what is the unknown value when 80% of a number is 12?

• 10

• 25

• 15

• 20

What is the result of 12 times 100 in the example problem?

• 800

• 1200

• 1500

• 120

What is the final answer for the unknown number in the example?

• 10

• 12

• 15

• 18